| Hey Dallas_E500
“The compensator is used to "compensate" for the small amount of power that is lost as a result of the extra RF cable needed to send or receive the signal through the vehicles antenna. The compensator is not a booster when in digital or analog modes”
MERCEDES BENZ TELEPHONE MANUAL
Diesel Benz is probable right about the compensator; you might not need it being that you’re using the Bluetooth adapter which doesn’t have a connection for the antenna. I would get only the cradle from the dealer or eBay if you can find it, version code, and ask the dealer to check and update the AGW if needed. You also want to get the Holder # Q 682 0768 which is screwed down inside the armrest and then the cradle sits in the holder | 
