cluosborne

Hi, I have a 2001 RX300 awd (not 2wd), and I recently changed the thermostat, but realized that the air bleed hole needs to be aligned in order for the thermostat to open and coolant to circulate. What position does the thermostat need to be aligned in (in regard to the bleed hole)? Is an OEM part the only recommended option or would an aftermarket part work just as well?