93 cobra's used a 10" velnted disk which works fine with 15" wheels. I have the 87 Turbo Coupe rear end which is the same rear eand with better gears. My stock 15" wheels fit with no problems.
I had 15x10's on newer Cobra brakes. I did find that it was VERY close. Weld wheels needed a little grinding on the caliper, while Centerline wheels fit without anything.