Take a look at this:
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=7968010191&fromMakeTrack=true

and this:
http://search.ebay.com/mercedes-climate-control_W0QQfkrZ1QQfromZR8

Lots of part numbers there. Then you can go to the following site and put in the part number with no spaces and the letter "A" before the number to see what it costs:

http://wwwsg.daimlerchrysler.com/Projects/wi/cda/etpl?ETNR=&from=query&etpl_lang=01

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1989 300CE Astralsilber/Schwarz
1992 300CE Schwarz/Schwarz