I had a Thule 591 bike carrier problem ad managed to get a BMW specific set of T-Bra bolts, perhpas this is another option to solve the same problem? Not sure if roof boxes can/should be mounted using the T-slot system...

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2008 E70 3.0D Msport
Titanium Silver, Nevada Black Leather, Brushed Aluminium Trim, Brushed Alu Window Surrounds, High Gloss Rails
20 Inch MSport Alloys, 3rd Row Seating, Heated Seats, Xenons, Media Pack, IPOD Adapter, Dimming+Folding Mirrors, Shine+Protect Pack