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When you order the M sport package I believe you can request black or silver. If you don't put in a request you just get the colour the factory picks. I don't know how they pick the default colour - with my carbon black M sport, roof rails were black by default.
Sorry no idea on costs and install but I'm pretty sure you can buy original BMW individual roof rails in black - a call to your dealer or google should confirm that.
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2009 e70 X5 30d MY10
Innovations | MSport | Carbon Black | Black Nevada | Aluminium Trim | 20" 227M | Panoramic Roof | Rear Side Sunblinds | 6NF | 3rd Row | Self-levelling Suspension | 35% Tint
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