Note that there's a slight difference in the driver's side front mat shape and the WeatherTec exact fit ones just did not fit properly for the X-drive verses the rear-wheel drive version of the vehicle. I'd bought the front and back sets last fall, and had to send the front ones back. I ended up with the factory ones for the front instead, but kept the rear WeatherTec version. They had not had a chance to measure the x-drive version and thought they were the same. They may have resolved that by now, but if you have an x-drive, I'd call them to double-check if they don't list different ones for the two drive versions.
The primary difference is in the shape of the transmission hump - the x-drive has a bump in it that the rear-drive version doesn't (or at least did on my Apr 2011 build x-drive).