Has anyone successfully installed a CD changer into a 2001 SLK 320? I want a CD changer, but I am not willing to pay the MB's price for it. Please don't refer me to the installation procedure on the SL32.com web site--it doesn't work for my car. I suspect the later model SLKs require something additional (I suspect there is some programming activity required for the head unit). So, if you have been successful, please forward specifics regarding CD changer model number and installation procedures. Thanks-