I got my in-dash AC kit from Jerry West at European Cooler Air.  Top notch quality.  I had it installed by a local mechanic, Bill at Affordable German (Phx, AZ).  Actually I ordered the entire AC system from him.  My 85 westy had factory air, but was junk.  The new rear unit is much quieter and blows a lot more air.

  http://www.europeancoolerair.com/

  tom