Here is a list of the genuine Mercedes Benz iPod kit current part numbers, and some links to where you can purchase the Mercedes Benz iPod kits from at a lower cost than the Mercedes dealer.  If its not here, its because Mercedes do not support iPod kits on those vehicles.

Model Year 2009 cars are the ones with Hard Disk Based COMAND or the Audio-20 with built in bluetooth telephony. This system appeared in the Vito/Viano/Sprinter for MY 2010.

The MORE link takes you to more information at a good online shop.

W169/W245/W164 A,B,ML,GL,R Class, Vito, Viano, Sprinter

W203 C Class, W209 CLK Class

W203 CLC Class

The CLC only got the new NTG2.5 telematics (i.e bluetooth built into the head unit & hard disk based COMAND) from a few months into the Model Year 2009. The MY2009 iPod kits only apply to cars with the NTG2.5 telematics.

W211 E Class, W219 CLS Class

 W204 new C Class, W204 GLK Class, W212 new E Class, W207 new E Class Coupe

W216 CL Class, W221 S Class

R171 SLK

R230 SL

Not possible, only Media Interface is supported from MY2009

 V1.3 05/02/2010