Gary, the real difference that I can see is the placement of the slide
lock.  On the passenger version it is near the front edge of the
window.  On the Westy it is more toward the middle of the sliding pane.
That is because the Westy version allows for the screen.  I wouldn't try
to replace just one pane of these as you pretty much have to wreck the
frame to get the glass out (unless you have figured out something that I
haven't).  I would just buy a whole good used sliding window and you
should be good.  As Chris mentioned, early Vanagon sliding door windows
are different than later models and early models had silver frames while
later ones have black frames so be sure to talk about all of these
things when ordering you replacement.

HTH,
Ken Wilford
John 3:16
www.vanagain.com

On 12/22/2010 10:32 PM, gary hradek wrote:
> What is the deal on these windows.   Some are half and half and others are one third and two thirds.   What went where if you need to replace a broken pane?   thanks, gary
>