I've had a look and the part number is 82 71 0 405 052, I googled the number and it seems that the roof rails are available at Amazon (£189) who list all of the variants that they fit; looks like they're only suitable for the E70 X5 The list is as follows: X5-E70-SUV-X5 3.0d M57N2-(FF41)-01.07.2007-...

Genuine BMW Dog Guard for a BMW X5, F15 for sale, excellent condition.
Pick up from Edinburgh preferred but can facilitate pick up by a courier at buyers expense; The dog guard is large and currently stored in a bicycle box and only for sale as I need the storage space.
£85

Original BMW E70 Roof bars to fit X5 with flat roof rails. Front and Rear roof crossbars, Special Key (Torque wrench), 2 x keys, Front and Rear cover strips and fitting instructions.
£60

Four BMW X5, E70, M Sport Style Alloy Wheels with Continental ContiSportContact RunFlat Tyres for sale, wheels and tyres are like new. 2 x Front Tyres are 255/50 R19 2 x Rear Tyres are 285/45 R19 Note, there are no centre caps, 4 of these can be purchased for £12 on Amazon. The only reason for sale ...

Four BMW X5, E70, M Sport Style Alloy Wheels with Winter Tyres for sale; Tyres are Vresdstein Wintrac 4 Extreme, tyres with excellent tread, having only been used for around 4000 miles. 2 x Front Tyres are 255/50 R19 2 x Rear Tyres are 285/45 R19 The wheels could benefit from a refurb due to a coupl...