That's a new one on me. The manual I have doesn't describe a non-power-windowed version of the car. The Thai builds sometimes don't have the harnesses in place - the ambient temp sensor, for example. The STX is made in Spain (VIN starts with VSK, the Thai cars VINs start with MNT). You might also find that the BCM (Body Control Module) in yours doesn't have the function for power windows. I don't know if you can fit a BCM from an STX (but that would give you the ability to add puddle lights in the external mirrors too, if it could be done).