for those of you with westys or overhead a/c take note...
  on my '84 wolfsburg vanagon w/ the overhead mounted a/c evaporator, i could
barely see out of the back window (my ac is actually even lower because i
have a sunroof van with the double thickness roof so it was really bad)  so i
got a rear view mirror from a '93 eurovan that is the windshield mount style
- mounts to the windshield w/ the little disc that is adhered on there w/
glue like most cars.  the eurovan mirror is as tall and wide as the vanagon
mirror so the visibility is superb.  this is how i mounted it.   first i took
off the original vanagon mirror (its for sale, by the way, black, and in
great shape) it just turns clockwise or counterclockwise to take it out.
then i got out of the van and went out front and measured down 5 and 3/4
inches from where the upper rubber seal touches the glass on the outside of
the vanagon windshield and marked it with a piece of white tape..  this will
be the center of the location of the mounting disc on the inside.  then i
used some rear view mirror adhesive and mounted the little disc  in that spot
on the inside, holding it in place with some masking tape while it dried.
i mounted the mirror the next day.  simple upgrade.  all is well, and mirror
has been in place for 3 months now..   and i can finally see out my back
window rather than looking at my a/c evaporator..
chris