The combo switch for your model is $127.40. You can buy it by clicking buy parts at the top of this web page. This is one part I wouldn't buy used.

You will need a ratchet set and a torx set as well as a breaker bar to remove the steering wheel. Airbag must come off first with a couple small torx, then I think the wheel bolt is T50 or something close.

Not really a hard job, I did it on my 300E. If you had someone do it, it would turn into a $300+ job quickly with labor.

-GH

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1992 Mercedes Benz 500SL
1998 BMW 528i
2003 Honda Element
2002 CBR600F4i
1977 Coachmen Motor Home