I resisted the change to the big wheels also, but there was no way those big Alcon brakes were going to fit otherwise. In addition to the rear wheel openings being radiused to eliminate the restrictive factory shape, both front and rear openings were raised one inch to allow the ride height to be lowered. The fender flares are patch panels for a '71 Mustang, and of course the rear wheel wells are all new. All of that allowed for the independent rear suspension with Hammerhead center section. Front suspension is Detroit Speed Alumaframe.