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john-9 said
The pic you posted of the backing plate shows the turned up edge of the parking brake strut which i have only seen on stock A-body backing plates . B,C ,E body backing plates have a flat parking brake strut.

That’s actually not completely true abut the parking brake struts. The SBP A-body drums have them. And pretty much all of the 10” BBP brake struts are flat. BUT- 11” brake struts also had that bent section. Not all of them, but a whole lot of them.

These are 11” brake struts, both factory and aftermarket