I see you have a pony package. That means you have the 17" wheels. If you are going to convert to the 18" OEM Mustang wheels, than it is going to rub against your front Brake Calipers (the rear wheel will have no problem). Simple and cheap solution is to buy a pair of 1/4" spacers for $14.99 at American Muscle: Mustang 1/4in 5-Lug Wheel and Brake Spacers - Pair at AmericanMuscle.com - Free Shipping! It is cheaper than having to convert to the bigger 12.4" GT brakes which cost $135.00. Believe me, it works.