oh no, is this 8.75 housing too bad?

I found this thread:

http://www.forabodiesonly.com/mopar/showthread.php?t=258919

And going by that, I measured 1.65, or roughly 1 3/4, so if that is correct, my backplates are BBP, and everything else I have is for the SBP 1 3/4 brakes, so again, screwed.