Jimacuda said A body 7-1/4 was big bolt pattern 73 and up only if it was a disc brake car. All A body 8-1/4's were big bolt pattern. F,M,J used 7-1/4 and 8-1/4, all large bolt pattern. More F bodies had 7-1/4's than 8-1/4's. F rears are wider than A's. Click to expand...