Hey Rob, what tools do you recommend or use for the alignment process? I'd like to do a shop alignment on my own without having to rely on an alignment shop. The toe settings are pretty easy, but how does a hobbyist actually measure camber and caster to the degree's you mention? Yep, I have your retro-8 chassis.
I can tell you they do not "make it" for the c20 because the frame rails are different from that of a C10. However, you can modify the bracket that sandwiches the frame to accommodate the difference in frame rails. My brother and I literally just tackled doing so as he has a C20 and this is what we experienced as we were not aware of the difference in frame rails and that the bracket would not accommodate.