Mopar 8 3/4 Rear End (A-Body) - Questions & Help....

Dana67Dart said

That and the OD of the center hole is smaller on the SBP 7 1/4

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Right, there's a lot of reasons the SBP 7.25's can't be used on anything other than SBP 7.25" axles.

But BBP 7.25" backing plates can be used on any BBP axle. Which is why you have to specify what 7.25 you have and not just say 7.25" backing plates won't work on an 8 3/4. BBP 7.25" backing plates work great on a BBP 8 3/4.