Backin Plates...

I used 7.25 complete brake set up off a 74 rear, on my 8.75 converted to BBP, Direct bolt on no modifications.
Yes, the large bolt pattern 7 1/4 plates are a bolt on. Mine are small bolt pattern, which only have four holes for the housing ends and not five. I'm just wondering if "everything else" is the same. Either way, I'll get it did.