I bought a pair of these mounts from Chevs of The 40s. Their description states they are for 1/2 ton, but if you check their 'Fits Vehicle Models' towards the bottom, it states these mounts will fit from 1947 to 1954 - 1/2, 3/4, 1, 1.5, and 2 ton trucks. I'll check the measurement later tonight.

It's a small world, but I wouldn't want to paint it.