I would think that the standard wheels were the 17" splitters with 17x 750s. If you have 16" rims that fit the front end, you are very lucky! You can put 16 x 235x 85s on and they are fairly close to the original size.

1951 GMC 1 Ton Flatbed -- It is finally on the road and what a great time I have driving it!
1951 1 Ton Completed

My Chevy Master 4 Door is on the Road!