Screw size! For Outdoor Cam

I’ve lost the screws for the Outdoor Cam. Anyone know what size they use, or should I drive an exterior screw through the base plate?image

The screw shaft is 1/8 inch dia. The head is 3/16" dia. the total length is 15/16" Just take the base to a hardware store and find something that will fit in the notch. The base is supposed to hang on the screw, I wouldn’t drill a hole though the base.