Available in 120mm, 150mm and 180mm.  
I designed these to go with my Ender 3 S1 Go Pro Style Mount and Logitech Quickcam Pro Webcam Mount. 

Both can be found here:

https://www.printables.com/model/220207-go-pro-style-mount-for-ender-s1-pro

https://www.printables.com/model/220209-go-pro-mount-for-logitech-quickcam-pro