Fox Mustang rear quarter window
(Image/Jim Smart)

When the Fox Body Mustang debuted in the fall of 1978, traditional Mustang enthusiasts were not on board. Old timers said the new Mustangs would never be collectible. We couldn’t have been any more mistaken. The 1979-93 Fox Mustang generation has become quite popular in recent years for the same reasons classic 1965-73 Mustangs are—nostalgia and reliving our youth.

And just like first and second-gen Mustangs, there are tons of restoration parts available for Fox Mustangs. A good example are replacement quarter windows for 1987-93 Mustangs. Molded from vulcanized rubber with embedded window glass, the one-piece factory assembly effectively blended the roof into the rear quarter-panel. But over time, the rubber starts to deteriorate due to exposure to UV rays and the elements. You’ll start to see pitting and fading which can quickly diminish the look of your Fox.

We replaced the faded quarter windows on our Fox Mustang with Scott Drake reproduction quarter windows. They’re easy to replace and you can do a complete install in a matter of hours. Let’s see how it’s done.

Fox Mustang rear quarter window body panel
When you examine the 1987-93 Mustang’s body structure, it becomes apparent it didn’t change much since the car was introduced in 1979. Ford went to one-piece, full width quarter windows in 1987 to update the car’s look and simplify assembly. The 1979-86 quarter windows are a multi-piece design and install from the inside, which involves removing and reinstalling exterior trim. The later windows install from the outside, which is much easier to do. (Image/Jim Smart)
Scott Drake Mustang reaplcement rear quarter windows
The Scott Drake quarter windows for come in pairs. They are manufactured from new tooling for a precision fit and feature tinted safety glass encapsulated in high-quality polyurethane and urethane. They have been lab-tested to endure extremes of weather conditions. (Image/Jim Smart)
Unpacking Scott Drake Mustang rear quarter window
The Scott Drake quarter windows arrived from Summit Racing free of damage and ready for installation. All we had to do was wipe down the contact surfaces to remove any residual oils that could affect sealing to the body. (Image/Jim Smart)
Removing Mustang rear quarter window studs
The quarter windows are secured by studs in the window assembly that accessed from the inside. You will have to pull the rear seat and quarter trim panels, but they’re a pop-in affair and easy to remove. (Image/Jim Smart)
Cleaning Mustang rear quarter window mounting surface
Body-to-window contact surfaces must be cleaned with a solvent like brake cleaner for a good contact seal. Even skin oil can adversely affect adhesion. (Image/Jim Smart)
Masking Mustang body for rear quarter window replacement
Masking tape is applied to protect exposed paint surfaces from potential damage. (Image/Jim Smart)
Applying sealer to Mustang rear quarter window
Windshield sealant is applied to all contact surfaces. It is a sealer and a flexible adhesive. Apply a nice thin bead as shown around the perimeter. Do not use silicone (RTV) sealant! (Image/Jim Smart)
Installing Mustang rear quarter window
The quarter window’s studs are carefully inserted through the body holes. Press firmly across the window at the perimeter and check for proper seating. (Image/Jim Smart)
Tightening Mustang rear quarter window studs
The retaining nuts are installed next. Follow a crisscross pattern around the perimeter until the window is fully seated. Snug down the nuts until there is resistance and stop tightening. If you overtighten, you will damage the window. (Image/Jim Smart)
Taping Mustang rear quarter window in place
Tape the window assembly as shown and do not disturb it for at least 24 hours. (Image/Jim Smart)
Reinstalling Mustang interior panels
Reinstall the quarter trim panel and rear seat. The nice thing about late model vehicles is the trim’s “pop together” demeanor which makes it simple to remove and replace. (Image/Jim Smart)
Author: Jim Smart

Jim Smart is a veteran automotive journalist, technical editor, and historian with hundreds of how-to and feature articles to his credit. Jim's also an enthusiast, and has owned and restored many classic vehicles, including an impressive mix of vintage Ford Mustangs.