Try these guys they may be able to match something up.
http://www.oldairproducts.com/shop/index.php
These guys might help too.
http://www.griffiths.com/porsche/
I think you need to take a  picture of the part.
Most VW A/C were port of entry installations and more than likely there is a
generic replacement out there for less than $100.00

Stan Wilder
Engine Ceramics
214-352-4931
www.engineceramics.com
----- Original Message -----
From: "Ray Reinhard" <rayreinhard@GMAIL.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Monday, September 12, 2005 2:41 PM
Subject: Camper A/C Switch (Outrageously Expensive)

I guess I'll just post my question again and see if there are any other
folks out there (parting out a Westy, perhaps?) who can help:

I am in need of a new switch for the A/C on my '86 Vanagon Camper. This is
the switch that controls on/off, fan blower speed, and temperature. At
first, my VW dealer told me that he thought this would run around $25. When
I came back to pick up my van that afternoon, he told me that this
particular A/C needed a special switch that COSTS $450!!! At first, I
thought he was joking, but he assured me that this was not a joke. I called
my local VW recycler and they said they couldn't help. Surely, someone among
you must have a solution that costs less than $450. (I've called Camelback.
They also quoted me a price of $450.)

The switch is located on the dash, to the right of the fresh air vent and to
the left of the steering column. It has two parts: an inner circular one
that toggles through 4 settings and an outer one that that is a
potentiometer (?) (moves smoothly, with no "stops"). The inner one controls
A/C on/off and fan speed, while the outer one controls temperature. Behind
the switch is a black piece of plastic with the following in white
(clockwise from lower left around the switch assembly): MAX COOL, A/C. OFF,
HI. Just to the right of this (on the same plastic piece) is (from top to
bottom): a fan icon, a vertical line, and the word TEMP.

The part # that I got from my VW dealer is 411 963 107-C

Thanks for your help!