If you have the standard navigation and do not have the Auxiliary Input Jack you will need a retro fit kit to add the Auxiliary Input to your head unit.
This is the kit to add the feature to the head unit.
If you need the cable that goes from the jack to your ipod, mp3 player, audio source, than a standard 1/8 inch jack to 1/8 inch jack stereo cable. The cable you mentioned is available
here on our website if you would like the OEM BMW cable.
Does that help?
ECS Tuning