Reworking an 8 1/4 and can't find ?

ProStocker273 said

I have a little info in my 8.25 built to race thread. I upgraded my axle shafts to the larger 29 spline from 27 spline. And got a new track lok with 4:56 gears. Mine came with 11" drums added by someone off a larger car. All my parts where from doctor diff. Nice guy and best prices I could find.

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I have been looking at his site, rear end work can be pricy I see ProStocker :glasses7:

I put a tape on my backing plates and they are 11'' across out side to out side :glasses7: what size !!! Shoot #-o shoes and Drums do I need to buy #-o Are my backing plates 10 then ? ? so many things to learn :pale: