What Dave said. The 10” BBP brakes are all the same, 8.25 rear axle BBP brakes will bolt right on to an 8 3/4 as long as you’re using BBP axles in the 8 3/4. For that matter the BBP brakes can be exchanged from 7.25’s, 8.25’s, 8 3/4’s, and Dana 60’s. It’s only the SBP stuff that doesn’t interchange between axles.