The two sides of the Ax are made differently and they just don't sit on there as well as they did on the x5 models. I have modded the x50 models a bit and they seem to fit a little better but like you said they just don't quite fit, at least comfortably.
The only other option and it didn't work real well is to extend the tabs to wrap around the back but then they hit the little rubber nubs that the Ax sits on and it rubs the paint and eventually the plastic off when you do that.
If someone has ideas I'm interested in them though!
