drum brake mag wheels only.

I know I used a grinder on my chebby 4x4 brake calipers to gain clearance for 14x15 Bart super trucker steel rims for the 17/40s

you might get away with that. I don't recommend it.

wonder if they fit the rear 11x2.5 brake drums on a 1/2 ton truck?

10" drums only maybe?