Info from a special tool site:

http://www.startekinfo.de/etools/content/tool.jsp?toolno=202%20589%2001%2031%2000
I could not referance the plate part numbers but the seller said he used it on a W208
so it looks like it will work on a 123.
http://www.startekinfo.de/etools/content/tool.jsp?toolno=202%20589%2013%2063%2000

__________________
84 300D, 82 Volvo 244Gl Diesel