http://www.kanter.com has lots of stuff for the cars, suspension, engine, etc. Vintage Power Wagons has the knowledge though, and are willing to help you figure out what you need, so in my opinion are worth it for the engine parts.
As far as rubber, Steele is the only supplier that I've heard of that doesn't sell ill-fitting products. There are other suppliers, like Burnbaum, but I've heard nothing but dissastifaction from guys who've used them. Most wind up redoing the rubber with Steele after finding out that there is no way to seal the bad stuff, spending even more $$.
My 2c....
Pete
