another 4 to 5 lug conversion question

The rears are the same. The 7.5 and 8.8 axles are interchangable. For the fronts, according to Matt90GT's website, http://svo73mm.cjb.net, you can run the 83-88 4 cyl Ranger rotors on your spindles, but you still have the poor 4 cyl brakes. To use the Mark VII rotors, you need the 87-93 V8 spindle, Mark VII rotor, and the 60mm Mustang calipers or the 73mm Mark VII calipers, but the 73mm would require a new master cylinder. But with either way you are limited on the wheels you can run. Almost all 96+ 17" wheels will not fit correctly with these rotors.

Hope this helps!