you can purchase the calipers, rotors and pads for a 93 cobra from autozone, good luck finding the mounting plates though. in the long run, cheaper to do 5 lug and buy new rims. or just put the t-bird rear end in and deal with the extra width. I've had a vert with a t-bird rear, gt with a 5lug swap i did and another gt that i put a '04 IRS in.
message me if you need some help