I also got the best radiator cap I could find which was the Porsche Cayman one( 996 106 447 04 which is like 6 revisions from the original vw one) which is a way better design and much better fit than the MK1 rabbit one I had but seemed to work just fine.
Pros: better design, better fit
Vehicle:
Volkswagen Corrado
Part number: 996 106 447 04
