Joe -
Call Otto's up in Venice & see if he has any in his 914 NOS stash, unless they're still generally available new at the dealers & usual sources.
Also try TC'sGarage.com cuz sometimes Tom Gould has hard to find & NOS stuff, same for Sierra Madre Collection up in Pasadena.
Last option would be to try the parts nos. Krusty gave you to see if there was a VW interchange part for the VW 2.0 in the 412 or Bus that will work, then try the vintage Dub websites & VW dealers for the part as a VW part.
Happy Hunting!