I put one in a CCX recently and it fit quite well from a Mustang/Summit kit FMS-M-5478-C2. The beauty of it was I cut the bottom plate to length, used the ends I cut off to make tabs to weld to the frame, did minimal bending and persuasion to get it in there, it also gave me solid steel mounts for the inside of the seat belt where it had previously been through glass with a washer
In the interests of full disclosure I actually set the car on fire welding the tabs to the chassis but that's a story for another thread...............
