I got mine from E-Bay

Easy to install. Luckily mine came with the cable connector.

The Voice module installs near the top of the equipment rack in Rear LHS of vehicle (above CD Changer and Nav Computer)

The wiring loom is a T shaped adaptor that connects between the Bluetooth ULF and the main car wiring loom. It simply plugs in and no coding necessary.

You can probably buy a wiring adaptor from your BMW dealer.