This part is listed by BMW as BMW part number 32416796445 (32-41-6-796-445) and is described as Genuine BMW Power Steering Pump for E70 X5 3.0si (2009-2010).
Only for models with Active Steering.
This is a Genuine BMW steering pump with a two year warranty. Buying a Genuine part will usually be more expensive than an OEM or aftermarket brand but you are assured that it meets BMW's designs for fitment, performance, and longevity. It will also be the very latest design, incorporating any updates or revisions that an aftermarket brand typically will ignore.
BMW Fitments:
X5 Series
E70 X5 (07-13) > X5 3.0si (07-10)