I found this on eBay under VW parts, hope someone can use it (if the price is right?)
http://cgi.ebay.com/ebaymotors/VW-Eberspachen-Vintage-German-Gasoline-Heater_W0QQitemZ320327976485QQcmdZViewItemQQptZMotors_Car_Truck_Parts_Accessories?hash=item320327976485&_trksid=p4506.c0.m245&_trkparms=72%3A543%7C65%3A12%7C39%3A1%7C240%3A1318