8 3/4 Backing plates SBP question

Jimacuda said

72 back won't fit, different axle flange size and bolt pattern.
73-76 A body I believe fit. Still used the 10x1.75 brakes but used common axle flange pattern.
76 up for sure. Just tore another late 70s 7.25 apart last week. Direct fit.
But those are 10x2.5 shoes for 76 up.

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73 -76 7 1/4 backing plates for big bolt pattern will not work. They will only work with big bolt pattern drums the offset of the backing plate is different for the wider shoes. A good reference is if you go to install big bolt axles and use the big bolt drums with small bolt backing plates the drum hits the backing plate. The reason why everyone is always looking for big bolt backing plates when when installing after market axles.