I should chime in on this one.  Our van had the Behr unit in the van when we
got it, even had the original radio relocation box.  When we got tired of
the radio doing funny things because of the heat it took sitting right below
the vents we wanted to move up to a CD player.  CD players don't like
sitting at a almost vertical angle, so other options were needed. Went to
the local stereo shop and picked up a roof top mounting pod for the deck to
fit into.  I removed the headliner and cut a hole for this pod to fit
through.  A royal PITA  to run the wires properly up the a and b pillars.
Also a little awkward to change a CD, but otherwise pretty clean in use.  I
can e-mail pics if anyone would like to see it.

Got this idea from a friends use of a "cockpit" style headliner CB/speaker
mounting in a pickup.

Mark
82 Westy