I put a Alpine CHM-S611 changer in with a MBZDA Alpine CD interface by Peripheral Electronics that works with all 1995 1/2-98 Mercedes head units. You'll need to initialize the head unit by doing the following:turn on radio with ignition,wait 3 sec,turn off radio with ignition,wait 5 sec,turn on radio with ignition. You can call 813-572-9255 ext 230 for tech assistance from Peripheral.Total installed cost was $497.