Under the hood.

Also in the 114 threads that come up if you type CCV in the search field.

Seriously, go to www.realoem.com and look up your exact year and model. It will show you the part, with part numbers and diagrams.

Good luck.

Edit: It occured that you may not be able to find it on realoem either. Look at this link: RealOEM.com * BMW E53 X5 4.4i Crankcase-Ventilation/oil separator

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue