Thanks for the helpful info here. I am able to locate the pre-wired CD changer cable in the trunk of my 1996 C280. If anyone here need more details, I can e-mail you some photos about where the cable is located. Now I am going to order cable adapter and Alpine changer from www.autotoys.com . Are they legitimate online retailer? Anyone has good/bad experience with them?
From the drawing diagram at Alpine official web site, it seems Alpine mounting bracket won't mount in the MB factory CD mounting area which is right behind the right tail light and beside the battery. I prefer not to mount the changer under the deck of rear window as I have seen from some installers' web sites. Can I get the mounting box from MB dealer or any other suppliers?