Nevermind. I've come across this rack in case anyone else is interested:

http://www.saris.com/p-226-traps-35-triple-track.aspx

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2008 X5 3.0si ~ Platinum Bronze/Tobacco/Bamboo
Premium~Premium Sound~Rear Climate~Technology~Auto Tailgate~Comfort Access~Comfort Seats~Running Boards~iPod~Sirius