These accessories are confusing. I order two Sena Bluetooth head sets for me and passenger. Will this product fit on mine and her's half helmet? With these head sets I think I also need two dongles (I thought I had two dongles but she may have cut one or both off a long time ago!). The dongles gives me wireless interface with CCT audio system and rider passenger wireless communication. Does anyone out there have Sena Bluetooth Wireless Head Sets that can help me with this and my dongle problem. Thanks, God's Speed.