My Westy came with rain shields.  (not sure what they're called, but they're
plastic inserts you fit into the driver and passenger windows that allow you
to keep your windows cracked open when it's raining.)

Is there any particular trick or secret to keeping them up where they
belong?  Mine always creep downward, and there's always at least a half-inch
gap at the top of the window.

Patti
90 Westy automatic