AC compreesor clutch bearing

[fireball]

I'm looking for the bearing number for the clutch on my 99 SIlverado AC compressor.When the clutch engages the bearing lets out a rattle,as a dry one does,and my mechanic friend will change it for me but I would like to have the bearing in hand when he tackles the project to limit the down time with my truck.Would it be possible to obtain this info here?I have replaced my share of bearings and know about how they are numbered ( stamped on the race ) so please no GM part numbers as the suppliers I plan to check with use original manufacturer numbers.Thanks.