1965–68 Mustang Fastback Fold-Down Rear Seat Interior Guide:
Complete Kits & Individual Parts for Restorations and Coupe-to-Fastback Conversions

1965-66 Mustang Fastback Fold Down Rear Seat Interior Parts

Restoring the rear interior of a classic Mustang Fastback can be one of the most rewarding parts of the build—but it can also be one of the easiest areas to underestimate.

The iconic 1965–68 Mustang Fastback fold-down rear seat interior is made up of far more than the rear seat itself. The seat frames, chrome moldings, trap door, hinges, latches, quarter-panel trim, upper interior panels, vent assemblies, mounting brackets and related hardware all work together to create the finished Fastback interior.

That is especially important if you are starting with a coupe and performing a Mustang coupe-to-fastback conversion. A coupe does not have the Fastback-specific rear interior brackets, trim mounting points and structural components required to install the Fastback interior correctly.

At Stang-Aholics, we offer 1965–66 and 1967–68 Mustang Fastback fold-down rear seat interior conversion kits, as well as many of the individual components builders need when completing a restoration one piece at a time.

This guide breaks down what you need to know before ordering.

What's Different About the 1965–66 and 1967–68 Fastback Rear Interiors?

The basic concept is the same for both generations: a split rear seat folds forward to provide a clean carpeted floor that makes the rear seat almost disappear and provides access to the rear cargo area, while a steel trap door separates the passenger compartment from the Trunk/Luggage area.

However, the details changed between the early and later cars.

For restoration purposes, it is best to treat the following as two separate applications:

  • 1965–1966 Mustang Fastback

  • 1967–1968 Mustang Fastback

The seat assemblies, trap-door components, latches, interior panels, brackets and trim do mostly differ, so ordering strictly by the model year of your Mustang is important.

There are also production-specific details to watch. For example, on our product pages, there are notes that some reproduction 1967–70 fold-down seat trim is more accurate for later 1968–70 cars than for early 1967/early-1968 applications. Always verify the exact part against your production year and restoration requirements before ordering your components.

1965–66 Mustang Fastback Fold-Down Rear Seat Interior Kit

If you're restoring a 1965 or 1966 Mustang Fastback—or converting a Coupe into a Fastback—the 1965–66 Mustang Coupe to Fastback Fold-Down Seat Rear Interior Kit is designed to bring together the major rear-interior components needed for the project.

The Stang-Aholics kit is SKU DI-656-FB-IFD-KIT and is intended for 1965–1966 Ford Mustang Fastback applications.

The 1965–66 kit includes:

  • Fold-down rear seat assembly and trim

  • Rear seat frame back and bottom

  • Rear seat trap door panel

  • Trap-door upper hinges

  • Fold-down seat latch and latch cover with hardware

  • Trap-door catch/latch

  • Fastback lower-side quarter trim panels with courtesy lights

  • Fastback quarter vent panels

  • Interior metal trim for panel joints

  • Fastback interior upper/corner trim components

  • Fastback body bracket kit for mounting the interior panels

The kit is intended to provide the major structural and trim pieces needed to establish the rear Fastback interior rather than requiring the builder to track down every major component individually.

Individual 1965–66 Fastback Interior Parts for Builders

Not every restoration needs an entire kit. You may already have some original components, or you may be replacing only rusted, damaged or missing pieces.

Here are some of the major individual components to consider.

1. 1965–66 Fastback Fold-Down Rear Seat Assembly

The rear seat is the centerpiece of the Fastback's fold-down interior.

Stang-Aholics offers a complete reproduction 1965–66 Mustang Fastback Fold Down Rear Seat assembly. The reproduction assembly includes the seat sections, new hinges and chrome trim moldings.

This is a particularly useful option when the original seat assembly is missing or too badly deteriorated to restore.

2. 1965–66 Fastback Trap Door

The trap door is the steel panel directly behind the fold-down rear seat. It separates the passenger compartment from the trunk/luggage area while providing access to the rear cargo space.

Stang-Aholics lists the 65–66 Mustang Fastback Trap Door, SKU DI-3660, as a reproduction replacement for a missing or damaged original.

A Scott Drake steel reproduction is also available, along with a version incorporating speaker pods for builders looking for additional audio options.

3. Trap-Door Hinges

A trap door is only useful if it operates correctly.

For 1965–66 cars, replacement trap-door hinge pairs are available in reproduction form. The Scott Drake version uses the original-style spring tension and cadmium-plated finish.

4. Trap-Door Latch/Catch

The trap door requires the appropriate latch to hold it securely in the closed position.

A 1965–68 Mustang Fastback Trap Door Latch, part number C5ZZ-6345704-A, is listed by Stang-Aholics as an individual replacement component.

5. Fold-Down Seat Latch and Cover

The fold-down seat itself uses a dedicated latch system.

For 1965–66 Fastbacks, the reproduction latch-and-cover set includes the latch, rubber stop, handle and cover. It installs behind the rear seat back along the passenger-side interior quarter-panel trim.

6. Rear Interior Quarter Panels

The rear quarter panels are an important visual component of a Fastback interior and are not interchangeable with the standard coupe interior.

Stang-Aholics offers reproduction 1965–66 Mustang Fastback rear interior quarter panels, including ABS reproduction options.

7. Upper Rear Interior Trim

The area surrounding the trap door and beneath the rear glass requires its own Fastback-specific upper trim.

Stang-Aholics lists a five-piece 1965–66 Fastback rear upper trim set, designed to finish the upper rear interior around the trap-door area.

8. Upper Quarter Vent Panels

The 1965–66 Fastback rear quarter vent area is another Fastback-specific component.

Stang-Aholics offers reproduction 1965–66 Fastback inner quarter-panel vent trim as a pair.

9. Rear Interior Quarter-Panel Moldings

The smaller steel moldings are easy to overlook when planning a restoration.

A 1965–66 five-piece rear interior quarter-panel molding set includes four molding strips and a center joint and is designed to finish the rear quarter-panel and rear-deck area.

10. Fastback Body and Interior Brackets

This is particularly important for a coupe-to-Fastback conversion.

The 1965–66 Fastback body-shell bracket kit contains 43 pieces of reproduction brackets and braces used throughout the Fastback structure. These components can be especially valuable when the original brackets are missing, rusted or were never present on the donor coupe.

1967–68 Mustang Fastback Fold-Down Rear Seat Interior Kit

For 1967 and 1968 Mustang Fastbacks, Stang-Aholics offers the 67–68 Mustang Coupe to Fastback Fold Down Seat Rear Interior Kit, SKU DI-678-FB-IFD-KIT.

The kit is designed around the major components required to recreate the Fastback fold-down rear interior and is also intended for coupe-to-Fastback conversion projects.

The 1967–68 kit includes:

  • Fold-down rear seat assembly and trim

  • Rear seat frame back and bottom

  • Rear seat trap-door panel

  • Trap-door hinges, latch and prop rod

  • Fold-down seat latches and latch covers

  • Trap-door catches and related hardware

  • Fastback lower-side quarter trim panels with courtesy lights

  • Fastback quarter vent panels and vent doors

  • Roof and quarter-panel interior metal trim

  • Fastback interior upper/corner trim components

  • Fastback body bracket kit

This gives the builder the major rear-interior pieces needed to transform an incomplete Fastback interior into a cohesive factory-style configuration.

Individual 1967–68 Fastback Interior Parts for Builders

Just like the earlier 65-66 Fastback models, there are plenty of reasons to purchase individual components rather than a complete kit.

You may have a solid original seat but need a new trap door. Or perhaps your interior panels are usable but the brackets and hardware are missing.

These are some of the key 1967–68 Fastback Interior components to consider.

1. 1967–68 Fastback Fold-Down Rear Seat Assembly

The fold-down rear seat assembly is the foundation of the rear interior.

Stang-Aholics carries a reproduction 1967–70 Fastback fold-down rear seat assembly. However, builders should pay close attention to the production-year note: the currently listed reproduction trim is more correct for late 1968–70 applications and can require additional work when used on 1967 or early-1968 cars because of differences in the seat-latch trim openings.

For a concours-level restoration, always verify the trim configuration before ordering.

2. 1967–68 Fastback Trap Door

The 1967–68 Fastback trap door is different from the earlier design and should be ordered for the correct model year.

Stang-Aholics lists the 1967–68 Mustang Fastback Dynacorn Rear Seat Trap Door, SKU DI-3661, as a reproduction steel trap-door panel with the correct embossed texture.

3. Trap-Door Upper Hinges

Replacement 1967–68 Fastback trap-door hinges are available individually.

The Scott Drake 67–68 hinge is part number C7ZB-6345702.

4. Trap-Door Prop Rod

The prop rod is another small component that can easily disappear during decades of previous repairs.

Stang-Aholics lists the 67–68 Mustang Trap Door Prop Rod, part number C7ZZ-6345734-A, as an individual component.

5. Fold-Down Seat Latches

The 1967–70 Fastback uses left- and right-hand fold-down seat latch assemblies.

Stang-Aholics lists:

  • C7ZZ-6361382-A — right-hand fold-down seat latch

  • C7ZZ-6361383-A — left-hand fold-down seat latch

These are sold individually and are applicable to 1967–70 Fastbacks.

6. 1967–68 Rear Quarter and Interior Panels

The rear interior quarter panels give the Fastback its distinctive finished appearance and accommodate the rear courtesy-light area.

Stang-Aholics offers 1967–68 Fastback rear interior panel options, including a nine-piece rear interior panel kit. The reproduction panels are designed around the original mounting points and stock trim and courtesy-light locations.

7. 1967–68 Quarter Upper Vent Panels with Grilles

The quarter vent area is another important difference between the coupe and Fastback.

Stang-Aholics offers complete 1967–68 Fastback trim-panel and quarter-vent assemblies as a pair. The reproduction assemblies include the chrome vent grilles and are made from black ABS plastic.

8. 1967–68 Upper Rear Interior Trim

The upper rear interior panels surround the trap door and cover the structure beneath the rear glass.

Stang-Aholics offers a five-piece 1967–68 Fastback upper rear interior trim panel set in ABS plastic.

9. 1967–68 Interior Body Brackets

If you're converting a coupe, don't overlook the brackets.

The 67–68 Mustang Fastback Interior Body Bracket Kit, SKU DI-67FBBRKT, contains 42 pieces designed to hold the rear interior panels in position and provide the Fastback-specific structural support that may be missing from a coupe.

For a coupe-to-Fastback build, these brackets can save a tremendous amount of time compared with trying to fabricate missing mounting points individually.

1965–66 vs. 1967–68 Mustang Fastback Rear Interior Parts

Component 1965–66 1967–68
Fold-down rear seat Year-specific Year-specific
Seat frame 1965–66 application 1967–70 reproduction application
Trap door 1965–66 1967–68
Trap-door hinges 1965–66 pair 1967–68
Trap-door latch 1965–68 common replacement available 1965–68 common replacement available
Fold-down seat latch 1965–66 style 1967–70 LH/RH assemblies
Quarter panels 1965–66 Fastback specific 1967–68 Fastback specific
Quarter vent trim 1965–66 1967–68
Upper rear interior trim 1965–66 1967–68
Interior/body brackets 43-piece 1965–66 kit 42-piece 1967–68 kit
Rear seat chrome molding 1965–66 configuration 1967–68 requires correct hole/notch configuration


The important takeaway is simple: do not assume that because a component is advertised as “1965–70 Fastback” that it is equally correct for every year.

Fitment and concours correctness are two different things.

What Else Do You Need to Finish the Interior?

The fold-down rear seat interior kits are designed around the structural and trim components of the rear interior. They are not complete upholstery kits.

The Stang-Aholics kit pages specifically note that colored or soft-trim components are not included, including:

  • Rear seat upholstery

  • Seat foam

  • Carpet

  • Headliner

  • Dash pad

  • Door panels

  • Other color-matched upholstery components

For example, Stang-Aholics also lists 1965–68 Fastback molded carpet and 65–70 Fastback rear seat foam as separate components.

This separation is actually useful for restorers because it allows you to choose the exact upholstery color, material and level of originality appropriate for your build.

Final Thoughts and Considerations

For builders who need most of the rear interior components, the Stang-Aholics' 1965–66 and 1967–68 Mustang Fastback Fold-Down Rear Seat Interior Kits provide a convenient starting point. For restorers who already have part of their interior, the individual components make it possible to replace only what is missing or beyond repair.

Whether you're building a concours-style restoration, a high-quality street car or a complete coupe-to-Fastback conversion, getting the rear interior components and structure right will make the rest of the interior installation considerably easier.

Build it right. Build it once. Get Everything you need at Stang-Aholics.com, and make your classic Mustang Fastback Fold-Down Seat interior look like it belongs in your Classic Mustang!

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