You need one of these:

http://www.seco-larm.com/Images/tblSS066TL.jpg

  It's called a pin-switch. It's for an alarm system (or whatever
accessory you wire to it) and is available at most any car stereo shop
for about 5 bucks. This one is called a flange-type, and fits the hole
in the door perfectly using 1 screw to fasten it. You trim it to length
after installation. I needed to remove the first plastic segment.

  I used it for foot lights below the door on the outside. Handy when
fumbling for shoes at midnight :)

Robyn

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf
Of Tom Salicos
Sent: Monday, October 15, 2007 3:24 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Sliding Door "Courtesy Light" Switch

I am working on installing an interior light that works off a pushbutton
switch when the slider opens.  I see there is a rectangular hole in the
column above the door lock contacts and a matching round hole on the
door.
Was this an option, meaning I might be able to find the appropriate
switch?

Tom Salicos
'87 Syncro Westy