10 X 2.5 in rear drum brake assemblies for 8.75 diff.

10x1.75 or 10x2.5?
A body or B,C,E Truck / Van?
10x2.5
Currently have 'want to buy' on FEBO website for E body drum brake assemblies. Prefer E body brake assemblies. Do not know all the in's and out's of brakes other than will tell Moser what I have obtained and they will build axles accordingly.