There are four factors to take into account when buying a projector mount. They are:
Weight. The maximum weight capacity for the projector mount is 15kgs
Check that your projector is able to be ceiling mounted
Mounting hole Pattern. Measure the mounting holes on the bottom of the projector. The longest reach from point to point of the projector mount legs is 320mm. If the legs were to reach in a square pattern then you would get a 220mm square. The Large Extension Legs will reach 260mm in a square or 380mm at their longest reach.
Drop. Check the specifications of your projector to see how far off the ceiling it needs to be mounted to get the best sized picture at the optimal height from the floor.