I used an 11" disc in my 50 1.5 ton dump truck, I checked all the measurements of the center hub section pretty closely to make sure nothing would hit or rub, there was enough clearance for the +1/8" per side radially, of the diameter increase from 10 3/4" to 11".

50 chevy 2-ton dump
71 C-20 Suburban 402/400
72 C-10 Suburban 350/3-speed