AMPS Ball mounts - 1", 20mm, 17mm

these are ball mount adapters that are compatible with AMPS mounting systems.  I use it on the Rubigrid mounting plate in my ford ranger. I have changed it to a solid infil with only a void in the middle of the ball. 

I use these bolts because they looks super clean and spread the force out.   M5x10 might give a little more wiggle room and work just as well. 

https://amzn.to/3VDMuFZ