I assume yours is a non-4matic?
Here are some food for thought:
HELP!! TIPS/DIYS: Chassis, Brakes, Exhaust, Steering, Suspension - Benzworld.org - Mercedes-Benz Discussion Forum
All of it can be DIYed even the stuff that is not DIY-able.... "If man can make it-Man can fix it".....
Best of luck,
MArtin