does anyone sell just the cork gasket? i see a new, non-original cap with gasket on ebay but I'd rather just buy the cork. or perhaps the spring has gotten tired so a whole new cap is better?

914Rubber.com has your replacement. There is a REASON why cork is no longer available.

I bought mine from 914rubber but also available from your local Porsche dealer.

On my list to buy from Mark,bought cardboard one ? for my plastic cap from pelican pretty much .
Need to knock back that fuel stink .