BasscatRJ,If we installed it on a 2006 Puma, then they are 1/4″ 20 thread. We do not drill or tap mounts. We assume the square head you are speaking of are the foot pedal screws, and those sound like a factory mount. The foot pedal is where we think you are seeing threaded in the base plate, we do drill those out rather than run a smaller screw. They are tapped for a rubber mount or cup for those who leave them loose.If we missed something, let us know in more detail what you need. BCB