Here's the procedure to install Bluetooth on the 2012:
The P/N is not the same, but if u look closely on the *.pdf I have given you, the Bluetooth P/N says that it has Antennas... I reckon it is just putting it in it's place, holding it with two screws (or so) and connecting a cable that is already there!!! Can you find one under the WNIC? If so, there's the place for the BT module
On the 2012, its...