2006 Bluetooth w/assist module part number - noob

[X5Bill]

2004 X5 4.4i 90000 miles
Hello everyone, just bought this fine ride last week and was wanting to get started modding...could you help with the following and don't kill me, I did
try the search function....
I need the Bluetooth w/assist module current part number, I have searched but there seems to be lots of different numbers...I was thinking an 06 so it would have VR...in looking at what I have, there is a BT antenna already mounted, would that be for the assist?
I am getting ready to place a Tischer order for a couple things and wanted to include the module...TIA!!
It looks like I am getting about 15.5 mpg while running the a/c in 100 degree heat, is that about right in town?