Auto connect also sell a unit, they are based in the UK, but they seem a good vendor.
I purchased a Tv in Motion and a Aux in interface from them and thay work well and seem well made.
http://www.auto-connect.co.uk/acatalog/BMW.html

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X5 3.0D Sport 2002.
SatNav, Tv, Phone, Aero Kit, Comfort seats, Heated Front & Rear Seats, Xenons, CD Changer, Sun Protection Glass, Tow Kit, Electric Folding Mirrors, Reversing Camera.

Mods
Digital Radio, Twin DVD Roof Screens, Xenon High Beams, Colour Trafficmaster, Roadpilot Pro with Laser.