My guess is that you will need NAPA #2621475. This corresponds to the interchange number of 3691111, which is listed as '46-53 2 ton. As mentioned above, the 2 ton model is a seperate beast than the 1.5 ton and smaller. Once you remove them we can figure out if you need oversized or not and come up with more numbers.

Good luck, Jeff

My 1953 Chevrolet
1947.1 Gallery
1972 C-10 1/2 Ton & 1972 C-30 1 Ton