Thank i got this one if you are interested 
http://www.ebay.co.uk/itm/USB-wii-sensor-bar-receiver-use-pc-play-WII-game-included-Dolphin-Emulator-/120880261270?pt=Video_Games_Accessories&hash=item1c25066896
..and here is the bluetooth dongle as mentioned in the compatibility list. I am using Mac os Lion i will let you know if how it works.
http://www.ebay.co.uk/itm/390335999290?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649
http://www.ebay.co.uk/itm/USB-wii-sensor-bar-receiver-use-pc-play-WII-game-included-Dolphin-Emulator-/120880261270?pt=Video_Games_Accessories&hash=item1c25066896
..and here is the bluetooth dongle as mentioned in the compatibility list. I am using Mac os Lion i will let you know if how it works.
http://www.ebay.co.uk/itm/390335999290?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649