I just bought a 69 GTO and want to put some old school 15" ss Cragars on it. Fat tires in the back (that dont rub or require any modification to the car) and normal size tires in the front. I've been googling and reading and entering info in all kinds of retail web sites for the past two days and still can't come up with a straight answer. I would think that someone would have figured out by now what the rim size and tire options are for my car. Anyone?