BTW, I have most of the part numbers for everything to convert an original RC10 to use B4 wheels and contemporary tires, if anyone is interested. Basically, you use B4 front caster blocks and steering knuckles/axles for the front wheels, then B4 or B44 rear hubs and B44 CVDs on the rear to use B4 rear wheels.
The only modifications necessary are reaming out the outer hinge pin holes in the front caster blocks and rear hubs to .125-.126" in order to use the RC10 hinge pins for everything that connects to old RC10 suspension components.
I know some people have used aluminum aftermarket rear hubs to generate more rear toe in, but I have not personally attempted that yet, so I can't comment on the fit.
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