I bought some for my 1 Ton a number of years ago. I bought them from LMC and they were listed for a 3/4 Ton. It took them three tries to send me the correct ones but I got them. They have them listed at the bottom of page 96 of their online catalog.

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!