On my 68 cuda convert I am running:
Front: 17" x 7 Torque Thrust on 5.5" back space. I dont know the tire size offhand but I can look at my car later tonight. It is the stock Mustang 5.0 size and available everywhere cheap.
Rears: CUSTOM Torque Thrust 17 x 8 with a 5" backspace. You need...