This is the Mercedes iPod kit for the new audio units supplied from Model Year 09 (i.e new cars delivered from mid June 08 onwards). This includes the A,B,ML,GL,R,W211-E,CLS,SLK class cars with COMAND or Audio-20. It is also suitable for the Vito/Viano from Model Year 2010 *with* bluetooth built into the head unit. It is not for the CLK.
It is not suitable for the S/CL or the W204 C Class or new W212/W207 E Class/coupe/estate or cars with the Audio-5 (no UK cars have Audio-5), or for the SL or SLS vehicles.