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 :
Amazon.com: RAM Mounts Ball Adapter for GoPro Mounting Bases RAP-B-202U-GOP2 with B Size 1" Ball : Electronics
Ball Base Plate with 1.5" x 2.5" 4- Hole Pattern by RAM Mount
RAM-B-259U RAM Mounts U-Channel Glare Shield Clamp Base with 1" Ball - Synergy Mounting Systems
RAM® Diamond Ball Base with Mounting Hardware – RAM Mounts
RAM Bond A Base - Inflatable/White - California Canoe & Kayak