B Body vs C Body 11x3 Drums

Does anyone know the difference between B body and C body FRONT 11x3 drums?

As far as I know they are the same.

also the same assembly on 1/2 ton, two wheel drive pickups with the 4 1/2" bolt pattern.
i'm "assuming" you are referring to the rear drums ?

Sorry, asking about the fronts - just clarified in the original post. Thanks!

i just looked in my wagner master catalog, and the B & C 11x3" drums are different part numbers.
that leads me to a couple of conclusions.
the spindles have different inside bearing sizes, or the brake stand-off is different between the backing plates of the B & C bodies.
now i haven't looked any of this up, just looked at the wagner part numbers.
does this help any ?

Just looked in my 70-71 FPM and the backing plates and hub/drum assy. are different numbers. Shoes and everything else are the same.

correct. the shoes, springs, etc, are the same, just the hub/drum assembly is different.

I have a few sets of 67 B-body front 11" drums and backing plates, I was wondering if they were the same also, so this helps! My assumption is that they are the same 67-69, correct?

Did B body have 11x3 front drums, I thought they were 2.5 ?

I'm only familiar with the 70-72 ones.

Yup. 11x3 was the HD option. Have a 70 and 71 GTX cars with them.

My '69 GTX had them as well. HD option, I think.