Anyone know where I can get some a arm bushings for 63-72?

[k1rodeoboater]

I got an extra set of A arms off of a 2nd gen c10 to put on my 66. I want to rebuild them while they are off of the truck, but I can't find just the bushings. I can find the cross shaft kits but not just the screw in bushings.

Also, what is the difference between 1st/2nd gen A arms vs 3rd gen arms? I know the 3rd gens have rubber pressed in bushings, but can those bushings be used on the older arms if you swap out the cross shafts?
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