I believe that the 1/2, 3/4, and 1 ton trucks all used the same size grill (as well has fenders and hood).
Only the 1.5 and 2 ton trucks had a larger grill, in order to accommodate their larger size fenders ( due to the larger tires that they had ).
Thats what I was told, however someone may correct me if i'm wrong.
1956 GMC 250 1 ton Dually NAPCO 4x4 W.I.P.
1952 Chevrolet 3800 1 ton Dually 4-53t Detroit Diesel swap W.I.P.
1948 GMC 250 1 ton Dually parts truck
My Photos 
