is your mechanic a dealer?
I'm not sure of the right part number, but I can tell you that no one other than a MB dealer will be able to install the changer. This, at least, is my understanding. I bought a changer for my 2002 C320 a few years ago and realized that I need to take apart quite a bit of the glovebox and nearby panels to get to the factory wiring and I was scared away by that. I later learned that a computer is needed to 'teach' the head unit to accept the changer anyway and only dealers have that computer, so even if I were able to physcially install and connect everything it still wouldn't work. They could have been lying to me, but I think its true.
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