We wanted to use the Cobra R wheels on our car, but their 9-inch width is tight. Ford Racing offered special versions for Fox Mustangs with this brake kit or similar Ford rear discs, which widen the rear track. The front wheels are standard '95 Cobra R (R58) with 5.98-inch backspacing while the special rears (M179) have 6.42 inches. Unfortunately, they have since been discontinued. Using a 17x8-inch SN-95 ('94-'04) factory-spec wheel with 5.72-inch backspacing would allow the same wheels on all four corners.