As additional info, apparently there are two different spare options for the X5 - this is the PN for the X5M spare, which by all accounts fits over the larger brakes:
5Jx19" ET:4 part number "36 11 6 775 450
I am assuming (big if, and I will check with my CA) that this is the spare included with the builds that include M Sport brakes. Looks like this:
