> if you or anyone out there has an idle stabilizer unit
> that will work for an 81 Calif. model Vanagon, please let me know.

> I understand that electronic modules from many other Audi and
> VW will interchange and have the exact part numbers.

These units are relatively inexpensive new.

http://busdepot.com/details.jsp?partnumber=251906083

This crosses from the 171 part number that you mentioned. The page also
lists which other vehicles take the same unit.

- Ron Salmon
  The Bus Depot, Inc.
  www.busdepot.com
  (215)  234-VWVW

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Toll-Free for Orders by PART # :  1-866-BUS-DEPOT