>  Why the smaler window in the westy?

With the larger non-westy window the latch is at the far right of the
sliding pane, allowing the window to open almost 50%. The westy latch is in
the middle of the pane and allows only 33% opening, leaving half the width
unobstructed on the left for "sliding room" when it's open, and half the
width on the right free to be covered by an interior window screen. If you
don't have a screen and never plan to get one, the larger window is arguably
better because it open farther.

--
John Bange
'90 Vanagon - "Geldsauger"