Yes, this string has gone off the rails a bit!
If you want a definitive answer then look in a Raybestos parts book and compare part numbers.
Look up a like a 68 A body Pontiac and then a 72 Camaro big block.
Just off the top of my head even though both rears could be had with 9.5” shoes, I do not think the backing plates are the same.
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I do stuff for reasons.
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