I am looking at installing a non merc 10 disc mp3 changer, but don't know where to start. I have a 96 E300D I need to know if I can plug in an FM adapter to the antenna socket on the back of the radio? or isn't it compatable with a standard FM antenna input? Where do I find keys to remove the radio? or is there a way I can make my own? Thanks! for any advice.. Indy