If remember correctly the factory rim size was 16.5. But i may be wrong. But I believe the 3/4 front rotors and even the rear drums are too big to fit in a 15" wheel unless you have alot of backspace.
Are these 15" rims OEM or some sort of aftermarket. I seem to remember from that era of pickup, the 15's were either 5 or 6 lug. OEM 15" rims will not fit. You might find some sort of aftermarket ones though.
