Gritch, Welcome to the sight and to the 60-66 group. Glad you are with us. Depending on what you need, check in with the guys at R & M Springworks in Bladensburg. You may be surprised with what they know and what they can get their hands on.
They can get you info about part number and what is compatible, if not else. I agree with Joe. Your search goes beyond 1/2 ton.
HB

~ HB
1966 Chevrolet K-10 | Ghost: formerly Flappy Fenders | In the Stovebolt Gallery
1962 Chevrolet C10
1962 Suburban