x-drive for N.A. cars come with square setup (at least that's for MY2011 + 2012 ... not sure for MY2013)
Originally Posted by Boss330
M550d (X-drive) has staggered wheels (245/40R19 - 275/35R19).
Not sure if that goes for the other X-drive cars, but the 245/40 and 275/35 should have the same rolling circumference and should not upset the X-drive.