Drum Sizes on a 1973 Scamp?

Hello Everyone.

I snagged an 8 1/4 rear end for dirt cheap, so it was an excellent upgrade over a 7 1/4. It also has a BBP, which is what I have a set of Rims in. The front drums however are I believe 9" and have the SBP. Do they make drums that feature the BBP but will fit on the smaller drum so I can run all four of the same rims instead of having my two nice one's in the back, and two steel wheels in the front?