There were no large bolt pattern drums for A body cars, only small pattern. The rule is if it came with disc, you got the large bolt pattern in either a 7 1/4” or an 8 1/4” rear. If it was a drum brake car, it was small bolt drums and a small bolt 7 1/4”. I’m not sure if this next fact, but I believe that after 72, there were no more 9” drums on anything.
