Brake shoes help (8 3/4 BBP)

Uh, nope nope nope.

Moser makes aftermaket axles with the 5x4.5" bolt pattern BUT ALSO with the SBP axle flange offset. If the 8.75 has 10x1.75" brakes on it now, you can't just swap the BBP 10x2.5" brakes and backing plates onto that 8.75", you'd have to swap to BBP axles that have the standard BBP axle flange offset.

You CAN use the 10x2.5" BBP brakes off the 7.25" rear axle though, they are the same as all the other 10x2.5" BBP brakes. But, you can't use them with a SBP axle flange offset.

BBP axle shafts copy.jpg

Maybe the previous owner didn't know the difference between the axle flange offsets and was trying to re-use the SBP brakes with a BBP axle. If that's the case your BBP 10x2.5" brakes will fit the 8 3/4 fine. But like I said, Moser makes axles with the BBP and the SBP axle flange offset, which have to be used with SBP axles and redrilled drums. If that's what you've got, the BBP brakes won't fit.