backing plate?

I have an 8 3/4 with the SBP axle right now. I plan on swapping the axle out for ones from Dr. Diff with BBP to match the BBP fronts. I am keeping the drum brakes in the rear but plan on purchasing the 10x2.5 kit from Dr. Diff.
After doing some research here, i have found that the backing plates that i have now will not work because they are for a SBP.
What is a common part # or vehicle i can search so i order the correct plates.
I would appreciate any help with this one.
Thanks.