For weatherstripping try restoration specialties located in Windber PA. They make most of the stuff that other resto houses sell for the early 60's mopes, usually they are cheaper as well !
Uli, don't buy any firewall gaskets or body plugs yet. I re-sent the package to you -- without the government-offending food this time :-D -- a couple weeks ago. It has to be getting through Customs soon. Hang in there. Hopefully you can use some of it.