Drums from a 7" 1/4 fit on 8" 1/4?

Alaskan_TA said

Backing plates interchange, they will fit the 8 3/4 also.

But you may need LBP drums.

Click to expand...

Wrong. Backing plates only interchange from 74-up BBP 7.25s. All of the earlier ones are 4 bolt.
8.75, 8.25 and BBP 7.25 all interchange.