I bought a 6 CD changer for my model 209 CLK 2004 since when I bought it out of state, it did not say it had one. Well it does so, for sale, Model MC 3010, Part # A203 820 90 89 which fits: S class 2000-2004 (S430, S500, S600), E class 1999-2002 (E55, E320, E420, E430, E300 diesel), C class 1999-2004 (C280, C32, C230K, C230, C320, C240), CLK 1999-2004, all models, ML 2001-2004 all models with fiber optic, SL 1999-2004, SLK 1999-2004. These things are supposed to just "plug and play" according to the websites. Plays CD, CD-R, CD/RW. Just plug in the prewired fiber optic cable and power plugs. They are either behind the panels behind the glove box or in the trunk by the battery. I searched the internet and everyone claims you just plug them in and it works since it is fiber optic and talks to the CD button on the radio and in the steering wheel. These things retail for $799-999. I got it for $310 in like new condition. I just want to get the money back or get some money back. My email is fadler@genbio.com and I can mail it out with check or PayPal by Priority Mail to you. My loss is your gain.