If your car isn't lowered you can put an 11''-11 1/2'' rim in there with a maximum backspacing of about 8'' with the 1.25 spacer. I have a 97 cobra with 11'' rims. they are 03 cobra wheels with 2'' added to the inside of the rim. I also have a 1'' wheel spacer. As it sits, the outside of the wheel is flush with the wheel well and I have about an inch of clearance between the rim and the upper control arm. It was about a 1/2'' which I though was a little close so I bought Edelbrock adjustable UCA's because they are smaller in diameter. Thus gaining that additional 1/2'' of clearance for peace of mind. When you order rims you will need to know the offset and backspacing which will be critical when you are planning on squeezing in a big wheel. I suggest you take as many preliminary measurements as possible. As for tires, I have a 315 35 17 and the entire tire fits under the car.
__________________ 97 Cobra-03 Cobra t56 and alum DS, SPEC111 clutch, FRPP 4:10,T&J Performance Forged 4v(8.9:1), Manley rods, Novi 2000 w/ Fast Track A/A I/C, Barry Grant Fuel syst., BBK longtubes and H-pipe, MSD ignition, Detroit True Track, Magnaflows, 315 NT01's on 17 x 11's, KB BAS, SCT tune and about a million other things. 575 RWHP. Going into the shop this winter, looking for 650 RWHP. | 
Widest wheels that will fit a 1996 Mustang cobra? 
