The part # is 51 47 0 418 105. I got them for about $550 which is pretty good compared to their $780 price tag. Installation cost me a lot because I got it installed at a different dealer. almost $400.

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2011 ///X5 M (On Order)

2009 X5 4.8 M Sport Space Gray/Black Fully Loaded

2007 GMC Yukon XL Denali Loaded and Customised