>        Since I cannot find a source of the damaged pre-combustion chamber
>cap, I now must replace the head on my turbo-diesel vanagon.

Sorry, Gary, I gave you a wrong hope:

I received a phone call from my VAG dealer and this is the
answer: The steel caps you requested are not available as
spare parts, only as already built-in into the heads.
Exchange heads (TD) will cost DM 1000.- for German customers,
and maybe additional DM 500.- for Canadian because of
shipping expenses.

Another story are steel caps for the Eurovan Diesel. They
are available as spare parts, but they are different from
the Vanagon Diesels.

Helmut
'80 Camper