Charger69rt8, years ago I bought a 36" long piece of double D steering shaft, I cut a short chunk off of it for each pin, and it works really well with a short piece of 1" pipe on the box side, with the notch cut out of it on the left side.
None of the older trucks had any bushings, they were all metal on metal. I polished the metal surfaces with a flap disc, and gave everything a light coating of white molly grease.

The bolt on GM brackets were OK, but usually by the time the pieces were shot, the bolts nearly always broke off. I usually ended up welding the bolt on pieces back on, if the flat pieces were good enough to weld to. Gene