Schnack (Ryan Schnackenberg, SM) has used Mustang wheels in the past, but the car was set up super stuff to avoid rub as they protruded a large amount from the fender wells. (In true classic FSP fashion).
Later he moved to sawzalled fenders with 16x9s
Normally his site is www.teammodamax.com
but it appears to be down right now.
These aren't the wheels, but it gives you a good idea: