Hello all, need some help. I have a 1992 Mustang GT Convertible that I want to convert to 5 lug with rear disc brakes. Let me tell you what I have. I have complete 1997 Cobra Mustang front disc brakes and the complete 8.8 rear end from the 97 cobra disc to disc. I would love to run the FR500 17x10.5 wheels in the rear. Can anyone tell me what the back spacing should be? Is it a 94-98, 99-04, or 05-09. I have no ideal and really need some help. Thank you much.