MPS used the front '04 subframe and suspension. With only a slight amount of fabrication, the '04's front end bolted right in. Aside from making the Mach 1 motor install easier, the '04 front clip also allowed for five-lug wheels and better brakes for the '91. Topping off the install is a shiny set of '07 GT wheels. In essence, this Fox now has parts from all the late-model Mustang generations.