Have you tried the search feature on this site ? Have you read the 'sticky' at the top of the page about searching ? Good reading...

Do you have any literature about your car ? Like the Haynes manual ? The CD available with the MB Factory shop manual on it ?

Some of these things are too complicated to post safely ... MB is way over engineered... and most items have two or three parts changing over the years... one warning not posted on here and you have a much bigger repair bill than you would have initially...