Those are M3 screws. Each "Y" shaped fork is probably around 5 cm long. Of course you can scale the 3D file to whatever size you want, if you have a bearing that fits, this one is scaled for the R2ZZ minibearing which is 1/8 x 3/8 x 5/32 inch
You might consider a second, less obvious camera with no illuminator, that just takes advantage the IR light from the first camera. In fact the first "camera" could also be just a shell with the IR LEDs but no camera.