[tim]

The rear end is definatly fox chassis because of the suspension. The fact that it's 5 lug leaves mustang out unless someone changed the axles and brakes. It is not lincoln or 84-86 svo mustang because those used the larger 11" rotors and different calipers. The caliper mounting brackets don't look like the usual stamped steel that ford uses. It may have aftermarcket axles and brakes on it. I looked in my ford motorsport catalog to see if they offered something in a 10" disc conversion but could not find anything.
Good luck, Tim