Converting rear drum brakes from SBP to BBP

That's exactly what I did.
Specify if you want the "wide offset" for the later drums if you're ordering axles for an 8 3/4. Strange knew exactly what I wanted.

My 8 3/4 is running Aspen/volare rear drums from drum to drum.

Edit: I mis- read the original post.
I don't think the spacing will work for any backing plate from the narrower shoes.
in other words, I think it's a one way street.

That said, I'll never run the sbp brakes ever again. The later model parts are way more available