The OEM supplier wheel bearing is FAG. It is cheaper than genuine and can be purchased here:
2009 BMW 335i Base Coupe - Axles, Bearings & Differential - Page 6. It is a sufficient replacement bearing as it contains the magnetic ring needed for the ABS and traction control systems to function. When installing it, just be sure to install with the magnetic side inboard.
Let me know if you have any questions.