I could be wrong but this is what a BMW tech told me. Any XDrive built before mid 2007 can not have upgrade or staggered wheels. BMW redesigned xdrive system for 2008 which explains why they now offered factory staggere on x cars from that year on. As i was shoppping for wheels for my X drive the guys at Tirerack said same thing to me. He would not put staggered on 2007 and previous drivetrain. Maybe this could be your issue. The production date of your car.
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