Steve,
I agree with you that there are 2 basic sizes of AD parts, small (1/2-1 ton) and large (1 1/2 up). The structure of the front fenders on the small is dimensionally the same as if it all came from the same tooling regardless of pick up or panel, but what I'm saying is that the wheel openings on the 1 tons have a different radius on SOME that are not on others so before someone goes and buys the fenders off of a 1 ton truck to put on the 1/2 ton project at home, they need to know what they are buying! They'll fit with your small hood, grill, and inner fenders, but you'll not be happy when you have different wheel openings from one side to the other!!