1965 C20 Trailing Arm Bushing same as C10?

[1965chevyc20]

I'm planning to have my rebuilt Chevy 14 bolt rearend powder coated before insalation into my `65 C-20 and thought I might take the trailing arms along. Started looking for new bushings for the remount and can't find any 3/4 tons listed anywere. So, my question is: Are these bushings the same specifications for 1/2 & 3/4 ton? Size and carrying capacity?

Thanks in advance for your time and imput.