RAM Mounts Tough-Ball with 1/4" screw - ball size 1"

RAM® Tough-Ball™ features a 1/4"-20 x .25" male threaded post for connection to a variety of devices.
 
It fits to out Top Cuff F3 & RT 20+  Click here 
it fits RT 2010-2019 Top Cuff - Click here
 
or any other place or product is suitable for RAM mounts