oh no, is this 8.75 housing too bad?

So I reviewed everything I could measure and that I know. Here's the breakdown:

Axles measure @27 11/16 end to end

2.3" hub register

offset approximately 2.25" from axle housing (where the axle mounts) to the outside wheel flange

the axles appear to be redrilled for large bolt pattern (the studs are pretty far out to the edge)

the drum register is a good fit

the drums have been redrilled for LBP, and were SBP to begin with

the friction surface of the drums is @ 2.3"

To me this all points to the drums and axles being 10 * 1 3/4, but I'm still trying to figure out how to tell for sure if my backing plates are correct or not for this. I think they might be 10 * 2.5" backing plates.