Just an FYI. There is difference in the number of bolts that hold the backing plate to the housing, between the 8 3/4 rear and the 7 1/4 rear. The 8 3/4 has 5 bolts, and the 9 inch and 10 brake small bolt pattern backing plates had 4 bolts. The large bolt pattern 7 1/4 backing plates, had 5 bolts.