As you can see the sway bar end links on my 220D were well past their best and not functioning. The free floating sway bar gave a nice clunk over any bumps. They would need to be replaced.
The wheels need to come off then only two 17mm wrenches are required for the top. The bottom only needs a single 17mm wrench.
The passenger side link completely fell apart on me as I took it off.
The driver’s side one looked better but was still not functional enough to locate the sway bar. The bottom nut isn’t required in the W114/W115 installation and just screws into the rear hub.
The new sway bar end link in. Very easy job to do on a 220D and the result is amazing. The Mercedes both handles and rides better. The slightly saggy end has also been corrected.
Old Car Junkie 
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I didn’t have any vibrations at speed but I heard all sorts of clunks at low speeds (road noise probably masked them at high speeds). The ride wasn’t too bad even when broken but handling did improve a bit once done.
Hello, thanks for your post!.
can you tell me when the gummy is broken, besides the horrible metal noise, does it also cause vibrations while driving over 50km/h? or should it be something else?