confused.. yes i say that a lot

I had this happen to me. I went from a 7 1/4 rear to a 8 3/4 that was SBP but I bought moser axles with green bearings for it. Put the 7 1/4 brakes on the 8 3/4. The drum hit the backing plate but, only on the outermost lip. I guess the axles were a tiny bit shorter? Since mine only hit that outer lip that sticks up into the drum I just took a grinder to it. Works good now.