I have a 67 Fastback with Granada spindles on the front and a 9-inch out of "what I don't know" in the back. I have American Racing torque Thrust D 15 x 7 3.76 backspace -6 mm offset from the spec sheet for that wheel. I have BFG 225 60 r15 all the way around. I did have to roll the fenders originally. I'm thinking the backspace 3.76 is the reason why I had to roll the fenders. I want to replace the wheels not the tires. I have stock upper control arms I did not drop them but I might want to in the future. So I'm thinking 15 x 7 or 15 x 8 and what should the backspace be, most wheels are either four or four and a half. I'm not sure what the offset should be. Any help would be appreciated.