Buying a car prepped for trackdays in Germany?

[mft]

I live in Switzerland, and am interested in picking up a car already modified for trackways (i.e. seat, cage, etc.) - does anyone know of any websites which might help, or alternatively likely search terms for the main car websites? (searching for 'ringwagen' doesn't help, for example.)

(I've also asked this in the Swiss forum, but I suspect Germany is more likely.)

Thanks

[Adenauer]

http://www.motorsport2000.de/motorsportmarktanzeig...

http://www.motorsportmarkt.de/inserate/rennfahrzeu...

Touristenfahrer.de has a good for sale section but you need to register.

Also Ebay normally brings up a number of results for Ringtoy or Ringwagen.

Edited by Adenauer on Monday 29th June 15:01