you can refer to Body, Wheels & Styling under X5 Home page. Below is the link for installation steps which you can go in reverse obviously. Looks pretty involved to me.

http://www.xoutpost.com/pdf/e70/e70_r...rd_install.pdf

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2011 BMW 740i
2011 Toyota Sienna Limited
2008 X5 3.0 Space Gray (sold)