I haven't had any issues with Realoem, but I can say that some things are not always clear for certain parts diagrams or with numerous part numbers/options. I always call my local BMW dealer parts department if I need confirmation.

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2005 Titanium Silver X5 4.8is (DD winter) * 2001 Steel Blue 750iL (DD summer) * 2001 Ford Excursion 7.3 L <> 2005 X5 3.0 * 2003 X5 4.4i * 2009 X3 3.0 * 2009 X5 3.0 * 2007 Toyota Avalon Limited