Are you looking to make your own kit? 
 
This ball base adapter can attach an AMPS GPS cradle or act as a base mounted on a dashboard. It uses a universal 1" ball, allowing for almost infinite adjustment and perfect viewing angles. It's a sturdy aluminum construction to keep the weight low with a durable anodization finish.
 
The diamond plate features two holes spaced by 1.912" or 49mm from center to center, matching the industry standard AMPS hole pattern. This is matching the diagonal of a 4 holes AMPS device.
 
This AMPS standard is compatible with almost all GPS cradles, InReach docking base, Phone cradles, and more! Check your device specs if unsure.
 
A non-exhaustive list of devices would be the Garmin Zumo, TomTom Rider, InReach Explorer+.
 
This product is only a diamond ball base within the ball mount system. Therefore, you may need to purchase other components to complete your setup.
 
Check out our Angled Base Adapter, Double Socket Arm or Square AMPS Cradle Adapter!