Gimmie a Brake HELP

Yeah, if you “knew” you’d realize it’s not even going to be close.

The offset on the backing plates is different by a half inch. But it’s not in the right direction. The SBP plates are a 1/2” shallower than the BBP plates. And the BBP drums are 3/4” deeper. The BBP axle flange is only about 5/16” further out. So, how much are you going to turn off those brake drums?

Here’s your backing plate measurements
Converting rear drum brakes from SBP to BBP

And your axle flange offset
View attachment 1715144028
Homework,Homework,Homework, this was an original BBP setup but one of the backing plates was damaged, so not knowing the difference I purchased a set off a fellow FABO member cleaned them up all new hardware and presto there not the right ones!

So to making things totally clear/fuzzy with the right BBP A body backing plates should/will fit the original BBP drums I just spent hours on, or just start over and get the B body set??