the 7&1/4 & (A body) 8&3/4 both use 1&3/4" wide shoes & as you know the shoe width has to match the drum width & requires a backing plate offset matched to them but I was thinking the 8&3/4 outer seal retainer & therefore the housing flange had 5 studs/nuts & only 4 on the 7&1/4 but I ain't sure on that. something was diferent iirc & man I was just over there earlier today but had other business on my mind