Apparently, there are multiple versions of the AMS. The one that came with my X1C is in the picture I attached. As you can see, it does not line up with this stand. This version only has 2 slits on each side. I measured it out and from the front screw to the 2nd slit should be 67mm apart, then 86mm in-between the 2 in the middle, then from the 3rd slot to the back screw is another 67mm… 
