My buddy is parting out a 95 GT, and it has brand new calipers in back. I'll show him this thread, but whats your email address in case he doesnt have an account on here.
GT and Cobra stuff is different. The backing plates are larger, the rotors are larger, and the caliper brackets are different. The calipers them selves look the same, but the diameter of the piston is larger by a few millimeters.