What are the recommended racing seats for a larger driver in a Mazda RX-7 FD?

Fitting an aftermarket seat for a larger driver into the Mazda RX-7 (FD) is notoriously challenging due to the very narrow floor pan and limited shoulder clearance against the door panels. Many standard wide-body racing seats will hit the transmission tunnel or prevent the door from closing.

Replacing the seats and rails is generally an Easy to Moderate difficulty task, though it may require some minor fabrication or trimming depending on your exact seat choice.

Here are the most recommended seat and rail options for larger drivers in the FD, along with a few interior modifications to maximize headroom and legroom.

Recommended Racing Seats

• Corbeau: Several taller drivers (6'2" and up) report fitting well in Corbeau seats, even while wearing a helmet in sunroof-equipped FDs. They are generally considered more comfortable for street use than hardcore fixed-back racing seats ¹.
• Kirkey / Ultrashield (Aluminum Seats): For drivers over 225 lbs or those needing a 17-inch seat width, aluminum seats are highly recommended. The Kirkey Intermediate Road Race seat fits the FD with no clearance issues, and you can mount it to the stock seat rails using a 1/2-inch spacer in the front to give the seat a comfortable rake ⁴. A 17-inch Ultrashield seat will also fit the cabin without rubbing the door or transmission tunnel ¹².
• Tillet XL Series: Models like the Tillet B6XL are excellent for larger drivers in small cars. Because they are designed without wide shoulder bolsters, they easily clear the FD's narrow cabin while still providing excellent lateral hold. Be aware that the high thigh bolsters can make getting in and out of the car more difficult ⁶.
• Recaro SR3 or SR-7: If you require a reclining seat, the Recaro SR3 and SR-7 will both fit the FD. When paired with Bride seat rails, the SR3 will actually sit lower than the factory seats ⁶.
• Sparco Evo II: This seat will accommodate a wider driver, but it does not drop right in. You will need to cut or trim the shoulder bolsters so they do not hit the interior door plastics ¹.

Seat Rails for Maximum Headroom

If you are running a bottom-mount bucket seat and need to maximize helmet clearance, the Bride Low Max rails (LF Type) are the most effective at dropping the seat toward the floor ¹¹.

Modification Tip: Even with the Low Max rails in the lowest mounting hole, the rear of the seat might still sit slightly off the floor. To drop the seat entirely, you can use a Dremel to notch out a small section (about 1.5 inches) of the fiberglass bucket where it makes contact with the rear of the rail ¹¹.

Additional Adjustments for Tall Drivers

If you are struggling with leg and knee room, the seat is only half the equation.

• Steering Wheel Spacer: The factory steering wheel is very large and sits too far away when the seat is pushed all the way back. Swapping to a smaller 330mm or 350mm aftermarket wheel (such as a Momo or a D-shaped wheel) paired with a 1-inch spacer or quick-release hub will pull the wheel closer to your chest and free up massive amounts of knee room ².
• Stock Seat Foam Modification: If you decide to stick with the OEM seats, note that the base model cloth or R1/R2 suede seats sit noticeably lower than the touring leather seats. You can further improve headroom by unzipping the factory seat cover and removing a layer of foam from the bottom cushion ².