I read somewhere that Mercedes only sells the entire unit. I dont know if that's accurate. I would check after you know what you need. You may also find a local machine shop that can manufacture the bad part but that may be expensive. It takes as much time to set up to make one part as it does to make 50. I have bought used parts from a place called star mark recycling in California. They will ship to you. Good luck. Be careful when you remove the blade assembly. It is spring loaded you don't want to break the windshield