Looking through some previous posts I found this. I think you can get them at any hardware store. Bring the camera with you if you can so you can make sure it fits right there in the store...
09/30/22 Replacement screws M3 x 8mm countersunk machine screws from amazon
When installing the mounting hardware for my new doorbell (battery) to the brick wall, one of the small screws that connects the base plate to the wedge
04/04/24 Terminal Screws for Doorbell 2nd Gen
it's an M2x4mm screw, my M2x4mm screws head was too small so I used a washer that came with it and used that to hold the wire down.
