You can use the 1987-88 Thunderbird Turbocoupe rear end. They are four lug with 10" disc brakes. They also have 3.55s or 3.73s already installed from the factory. I got mine from the junkyard for around $200 but a lot of people on the message boards have found them cheaper. I believe the 1993 Cobras have the same rear end as the TCs but it would be hard finding one of those. Hope this helps.
Kevin
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