Lost actuator screws

I have replaced all three and the control unit in the dash. One behind the glove box and both under the drivers side. One of those has come off and is hanging down. I do not find the screws on the floor and think I may have vacuumed them up at the last car washing. I need to know what size the three screws are so I can fix it since Austin is actually getting some freezing weather for a change. I need some heat.