not CL but Kijiji: Judson supercharger
http://bc.kijiji.ca/c-cars-vehicles-auto-parts-tires-engine-engine-parts-VW-Judson-supercharger-RARE-W0QQAdIdZ359531763
it's pretty bagged. I looked into it a couple of years ago. After a complete rebuild + missing parts you're better of starting with a decent kit from the start. Nice enough guy though.
To clarify a bit (my last e-mail about it):
Yeah I'd say that one definately needs a new rotor. I think it is probably more obvious looking at it where you are, but if I blow up the pics and measure the gaps I can see it here too. Just looking at yours in comparison to the completely rebuilt kits for $15-1700? ($800 your asking price) $450 for a new rotor, $100 for new vanes, $175 for a proper air cleaner, $142 for the correct oiler jar with decal and I'm already at $1667. That's not going into belts, cleaning everything up, rebuild kit for oiler if it needs it, finding the proper fuel pump spring, carb jets, and all the other misc stuff. I would be interested at around $450, but even at that I may still be better off getting a kit that was already rebuilt. I hope you understand I mean you no disrespect in any way. Just these parts cost what they cost, and are available from very few sources......