2 different 10x1 3/4, 8 3/4 backing plates?

AbodyBB said
Don’t know the depth of knowledge the OP was asking for but that’s helped me out

It is all good info.

Luckily I have it all sorfted out now.

I now have 2 sets of 69 up with piston stop tab backing plates and 1 set of 67 (maybe into 68???) No piston stop backing plates.

Since my 8 3/4 is going into my 67 Dart I'm using the push down adjuster and the no piston stop backing plates. Just easier to keep everything 67.

But wow what a education, and on a fluke that my friends (I learned it was a wrecking yard aquired rear) had one of each backing plates on it.

All of my experience with drum brakes has been with the push down adjuster style brakes.

I looked at the Ford backing plates to see if they looked the same, ( bolt holes would be diferent for sure) and they are not the same stamping.