I found this site and it seems pretty comprehensive. Just enter the year, model and a few specs and it list part numbers and show exploded views. It only list models made before March of '09 and my car was a April build so it didn't recognize the VIN. I checked some parts that I have installed and the numbers matched so it seems up to date. Way easier than calling a dealer and searching!
http://bmwfans.info/parts/catalog/
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Scott - 2012 BMW X6 50i Twin Turbo / Porsche 996 Twin Turbo
Black Sapphire Metallic with Saddle Brown Nevada Leather, Comfort Access keyless entry, Running boards, Rear-View Camera, Dark Bamboo wood trim, HUD, HD Radio, Satellite Radio, Cold Weather Package, Premium Package, Premium Sound Package, Rear Climate Package, Sport Package, Euro Black Kidney Grill, Euro Side Markers, Black Double Spoke 215 Wheels...