This is a mount for the AOS 3.5 v2 to fit the stock Runcam Thumb Pro 4k holder or similar cam holders.
I've added 2 versions - v5 is the earlier that allows a bit less uptilt and v6 lets you adjust the uptilt higher for faster flying.
Btw. the cam lens protection sleeve is by flexible363 and can be found here https://www.thingiverse.com/thing:5524774/files
The author hasn't provided the model origin yet.