What is the deal? SBP 10"×1 3/4" backing plates.

JDMopar said
How about a truck 9 1/4 thrown into that mix? Say, taking the brakes, backing plates and all and drilling the 5th hole to mount them on 8 3/4?
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I am not familiar with the details on the 9 1/4, other than it's a good rear end. If I had one under something, it'd stay there.