All pivot heel bindings have the same mounting holes. This includes all Look P-series bindings and all Rossi, Axial bindings.
The new PX and Axial2 bindings are very similar. The toepiece have the same mounting holes as the old pivot bindings. The heelpiece however uses the holes for Rossi Axium and Look NX series bindings.
So, if you mount bindings for a living, Rossi and Look simplified it this year by making all their adult bindings with the exact same mounting holes. Just ask to measure the Axium, Axial2, NX, or PX jigs and you'll be fine.
Another neat fact: The mounting holes on the Axial2/PX bindings have a width that are only 1mm different from the rear mounting holes on the Salomon heelpieces.