Sorry if this is a repeat.  I have an installed but never used rear AC unit
for a GL..  Pretty sure it fits 86-91, but not sure about earlier
models.  Bought from BD a couple years ago.  Wilfy says each of the 2
blower fans for this unit are $400 each, so the asking price for this unit
is $200 OBO (and that includes offers over 200!!).  Shipping from central
AR, unit is a little on the heavy side.  Eamil if you have ???

Dimwitted Moose and Flying Squirrel