Chevrolet made two different size fenders for 58/59. The small fenders fit the 30 Series (1/2 thru 1 ton) and the large fender fit the 40, 60, 80 & 100 Series (1-1/2 thru 2-1/2 ton).
So, if you want to build a 1 ton truck you might want to find a 1 ton donor truck. It would give you the smaller fenders/front clip, smaller frame, smaller springs & hangers etc...just a thought.
Mike B
