Here is how I replaced my plastic sliding window guides: I modified my
aluminium window slides (the ones glued to the bottom of the sliding
windows) In order to modify the aluminium slides to make them properly
accept the newer vanagon plastic guides you first need to remove the
sliding window.  To do this you have to remove the window latch (I used a
flat screwdriver bit to remove the latch's retaining screw located on the
bottom of the latch. I first loosened the screw with the flat screwdriver
bit and a small adjustable wrench, then I finished removing the screw with
the screwdriver bit with my
fingers).  I then removed the rubber window channel so that I could lift the
sliding window up and then supposedly out.  This is where it got a little
tricky for me, because it would not come out like it was supposed to.  I had
to use some of those big carpenters clamps that can be used to spread thing
apart and
spread the aluminium window frame apart just a little bit so that the window
would come out (I also had to use a wide scraper in the middle of the window
(between the window glass and the aluminium frame) to ease the window out
with very little force).  This whole process only took about 5 minutes on
the second window (once I had figured out how to get the window out).  Once
I had the window out, I looked at the new plastic window guided and figured
out how the aluminium window slide had to be modified for the new guides to
lock into place. Pretty hard to describe this part but it will be evident
once you look at the aluminium slide and the new plastic guide.  Here is my
attempt to describe what I did: I lined up the new plastic guide on the
aluminium slide and marked the little ridge inside the aluminium slide where
the plastic guide should lock into it (you can see the locking part on the
new plastic guided). I then took my Dremel and took a little notch out of
the ridge of the window slide for the guides to lock into it.  I then had to
shave off a little bit of the aluminium ridge from the notch that I made to
the
end of the slide so the guide would slide in properly.  Hope this explaines
what I did, but it sound confusing...but once you get going
you will see what needs to be done...and my description will likely make
more sense.  Please feel free to pmail if you have any other questions.

Pascal
'84 Westy