Yes the WEBASTO is the gas heater used in older cars.
I just saw this one that poped up on ebay that I think Im going to buy (dont even think of sniping this auction anyone).
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&category=33548&item=7944818514
I was just wondering how hard it would be to do such a instalation and to find replacement parts.