Some of these switchs are interchangable. I just got one off e bay for 5$ plus 4$ shipping. Like new. It came off a 124 and i used it on my 201. Do a search on e bay and compare parts. If you look up parts on this site you will find that MB uses the same parts for many cars.

__________________
2009 CLS550 55,000
2004 ML350 144,000
2004 X5 95,000
2002 X5 165,000
1996 320S 155,000 (sold)
1991 190E 192,000 (sold)
1989 300SE 160,00 (sold)
1984 300D 210,000 owned since 85, (sold)
1984 300SD 160,000 (sold)