Hi all,
I'm in the process of upgrading my old round pin tuner to a flat pin 2005 tuner that supports AUX In. I'm planning to add AUX in at the tuner in the trunk, but it's not clear exactly which particular BMW AUX In part number is the right one to use. My reading of what I'll be doing is pulling out the pins from the standard connector and plugging them into the new wire harness to the tuner.

Does anyone know the right part number I should be ordering to do this retrofit properly?

Thanks for your help!