RAM Mounts Action Camera Universal Ball Adapter - Cycle Gear
Amazon.com: BRCOVAN Aluminum Alloy Mount Base with 1'' TPU Ball & 10mm Mounting Hole, Angled Bolt Head Adapter Ball Base Compatible with RAM Mounts B Size 1 Inch Ball Double Socket Arm :
The RAM Mount Adapter [1" Ball] - MYGOFLIGHT
RAM-D-202U RAM Mounts Large 3.68-Inch Dia Round Plate with D-Size 2.25-Inch Ball
RAM® Universal Double Ball Mount with Two Round Plates - Walmart.com
RAM Mounts Ball Base | 10% ($1.39) Off! - RevZilla
RAM MOUNTS 1" Ball-Mount Base with Rectangular Plate
RAM Mounts Add-A-Ball Mounting Arm - Walmart.com
Zebra VESA Plate RAM Ball Mount - MT3501 | Advanced Automation, Inc.