This is the wiring loom you need to add the 3.5mm auxiliary input to W203 C and W209 CLK class which have an intermediate connector in the passenger footwell wiring duct.
It is also suitable for W208 CLK and W210 E class cars that have COMAND factory fitted but do not have the AUX connector in the glovebox
It is also suitable for W208 CLK and W210 E class cars that have COMAND factory fitted but do not have the AUX connector in the glovebox