I had an older wagon, w123, but same hydraulic suspension system. When I first got the car it was bone jarring to go over any type of bump due to the rear accumulators being shot. As soon as I replaced them it was like a whole new car. You should be able to have the strut rebuilt at a hydraulic shop v. buying a new unit as it is most likely just the seals that are worn. just check the yellow for a hose/hydraulic repair shop. Good luck.