Springs are a difficult part to look up in a Mercedes parts catalogue, and it takes a good parts advisor a few minutes to look at all the footnotes and make sure you have the correct ones. If you are sure you have the factory springs installed note the paint marks colors and number of marks, and then provide that info to the Mercedes Benz parts advisor, as it will simplify the process and prevent mistakes. Be careful because you may not have the original springs in your car. If the ride height looks off it is best to have it double checked. Springs do fatigue with time, then become weaker and compress more for a given force to be applied.
In New England with all the road salt it is very common to see coil springs broken on the bottom ends, this drops the car down slightly but this is not always noticed. Broken springs will be noisy over bumps, and sound different than most other worn components. Sacrificial zinc anodes were available for some chassis to prevent this type of corrosion damage. These parts are not commonly installed and may not be readily available. If your front end drags on parking lot curb stops it could be a good indication that you have broken front springs.
C class W203 chassis commonly have broken rear springs. You may hear a broken coil rattle around inside the rear control arm over bumps. ML W163 trucks have broken rear coil springs on the struts; these are replaced as an assembly. E class W210 chassis have spring perches that break off the body due to broken spot welds and corrosion. Replacement perches can be welded on once the spring is removed. Surprisingly, with this type of failure the spring is usually contained against the shock but it could come free eventually if ignored. Use caution with springs as coil springs can expand with lethal force if the correct spring compressor is not used to remove them or the tool fails.
Call or email us if you are having problems with your springs or have questions.