I used a 93 Mustang GT rear. The rear end width is uncut and otherwise unmodified. I have SSBC 12" rotors and calipers all around. The rear Halibrand 17" wheels have Nitto 555 drag radials 275/40/17. With the Mustang 8.8 factory width you can't put a larger tire on the back of a Street Beast without narrowing, modifying the trunk fiberglass or running the risk of tires contacting the fender's.
The stock Mustang II front width required me to go with maximum wheel back spacing where as the rear was just the opposite with the wheels dished.
