The 73 A-bodies was the year of change....
73 and up with a /6 and drum brakes = small bolt (4 inch )
73 and up with V8 and disc brakes = big bolt ( 4.5 inch )
Before 73 , A bodies were small bolt , and had either 14 x 4.5
or 14 x 5.5 steel wheels also 14 x 5.5 Ralley wheels....
Frank
