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1. What you have:

79-82 All (except 79 V8): 9.15" front disc, 7.5" rear axle with 9" drums. 4 Lug.
 

1979 V8, 82-85 all (except SVO), 86-93 4cyl: 10" front disc, 60mm single piston caliper. 7.5" rear axle with 9" drums. 4 lug.

1986 GT: 10" front disc, 60mm single piston caliper. 8.8 rear axle with 9" drums. 4 lug.

1984-86 SVO: 11" front rotors, 73mm single piston caliper. 7.5" rear axle with 11.375" rear disc brakes. 54mm rear pistons, 5 lug. Rear is 1.25" per side wider than 87-93. Same rear brakes as the Lincoln Mark7s.

1987-1993 GTs and LX 5.0s: 11" front rotors, 60mm single piston caliper. 8.8" rear axle with 9" drums. 4 lug.

1987-1993 Saleen Mustangs: Same as the SVO brakes -- 11" front rotors, 73mm single piston caliper. 8.8" rear axle with 11.375" rear disc brakes. 54mm rear pistons, 5 lug. Rear is 1.25" per side wider than 87-93. Same rear brakes as the Lincoln Mark7s. There were optional brakes on the SA-10 and SC cars that used the Alcon 4-6 piston 13" front brakes.
 

1993 Cobra: 11" front rotors (larger hat to match the rear offset), 60mm single piston caliper. 8.8" rear axle with 87-88 Tbird Turbo Coupe 10" disc brakes. 38mm rear pistons. 4 lug, different offset from GTs. Rear is .75" per side wider than GT/LX

'93 Cobra R: 13x1.1" vented rotors, PBR dual piston 38mm unit from Corvette (interchangeable with 94-98 Cobra and Bullitt calipers). 10.5" rear vented disc.