Usually a 15x8" wheel with 4" backspacing will fit on the rear. Also you should be able to run either a P295/50R15 or a P275/60R15 Tire. Nine outta ten times it'll work. Measure to make sure, sometimes SH!T HAPPENS.
I've got 15x8 Rally's on the rear of my '69 with 255/60 tires. I believe the backspacing is 4.5" (I'll try to check tonight to make sure). Mine don't rub and have about 1/2" clearance to fenderwell edge. Are you springs old?? Might be sitting too low.
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