Thanks Cletus, I've read up on it some in other forums. I'd have to drill an additional hole in the 7.25 backing plate and enlarge the center hole where the shafts go in. But I saw that guys that did it had a problem with a gap between the backing plate and the rear housing of the 8.75. I'm just gonna get a plate that was meant for the 8.75 housing instead. Maybe I'll go with 10" brakes?