I found a very good russian etka online that had all the old obsolete part numbers even back to mk1 stuff. Had to run it through google translator but it was very useful when I was hunting for badges for my mk2.

http://www.numcat.ru/volkswagen/

http://translate.google.com/

This is also good.

http://www.vagcat.com/epc/

If you use google chrome, it will translate it for you.

I've used that before too, I found the russian one more useful though as it goes way back, its not filled with 'no longer availables' like the newer catalogues are.