05 mini. help needed

hi there, I need help to locate the part and number for the gear that goes/connects the turbo and works somewhat with the waterpump for a 05 mini turbo
sorry I dont have much more details, its not for me nor for my car. I'll put more info as soon as I can.

it's for a R53 2005 Cooper S. the grear is part of the supercharger. it connects the supercharger and the water pump. I think that gear does not come by itself, he may have to buy the whole supercharger.

http://realoem.com/bmw/showparts.do?...92&hg=11&fg=50