Hi all im a new member bought a Ml320 w164 2005 just took it to mercedes for a fault and theyhave reported numerous other faults wrong with the car something i know how to tackle but one that I'm stuck on it all 4 level sensor link rods seized ,how easy are they to change and what are they?

Any help very much appreciated in advanced

 

If you have airmatic ,its the small rods that adjust height, one on each wheel