C10/C20 Body Differences

[mschwader]

I have a '62 C20 that I have pretty much had to replace Fenders, grill support, and radiator support with aftermarket items due to rust or other damage. Trying to do a dry fit right now and the holes just aren't lining up. Some more than an inch off......AM I missing something here? There's nothing I have found when going back and looking at what I ordered compared to the options available that had a different part number for a C10 over a C20.