7.25 axle splines

Backing plates are different between the small bolt pattern rear and the large bolt pattern rear. small BP backing plates have 4 mounting holes, and LBP backing plates have 5 mounting holes. Not positive if the LBP plates would fit using just 4 bolts, but you also need to check the offset. I don't know if that is the same. Also I think the center hole is different, as the bearing size is different. Brake size might be different, also. 9 inch as compared to 10 inch.