Lost Spotlight Cam Plus collar ring screw

Hi, When installing a new Spotlight Cam, I accidentally dropped and lost the ring collar screw on the adjustable wall mount. I've searched round on here to see if a replacement screw is available. I also contacted customer support, who sent me a link to replacement screw parts. However, the screw I need doesn't seem to be featured. Has anyone had any luck in funding one? Thanks in advance! PS - here's a photo of the screw, taken from one of my other Ring cameras.