Registered just to say thanks and add to the conversation for the next guy...
Bought a 2008 M45 S with only 64K on the odometer...immaculate condition! Only downside was no Bluetooth audio, so I began a frantic search online and came across this thread.
First tried the BT45-INFI USA SPEC, eBay used $90. Didn't fit my car, I believe due to it having navigation.
Working solution was the OEM 284H2-1BA0B cable (got mine from partsfornissans.com) and the Bovee 1000 from Amazon. Didn't need anything else.
Took a few tries for initial pairing, but once connected it sees my phone consistently now. I have an Android, so the car display is lacking. No big deal since I usually keep it on maps anyway. Steering wheel controls work great and best of all the cable and Bovee are tucked away in the center console out of sight!
All set! Thanks again initial poster and all who contributed info