i'm trying to add a new combined BT / Assist module to my 2004 X5. I started looking to see what i have in the back. Ihave what looks to be a BT antenna already (see pic) part number 84506928461-01 02-04 and I also don't know what the module is tucked in the bottom (assist maybe?) how can i tell what's going on back there. Supposedly i don't have Bt already. The dealer is pretty clueless. thanks guys
unknown pieces (http://homepage.mac.com/ahmadof/PhotoAlbum9.html)

Part #84506928461 is the Blutooth Antenna.