you sure it's a supercharger? There's a smog pump for early watercooled VWs (with a VW logo stamped on it) that looks pretty similar to a supercharger and looks like it'll bolt onto an aircooled manifold (same bolt pattern). Every once in awhile I see it on eBay or elsewhere the seller thinking it's a rare factory supercharger. VW never made a supercharger, they were always outsourced to other companies so if it has a VW stamp it's not a supercharger
You have a pict of yours?
For reference here's the most common vintage VW supercharger made by Judson
And a more rare vintage charger, Shorrock
And the only rcurrentsupercharger you can buy today, DLI:
Modified by nicnaor at 5:56 PM 1-19-2006