Amazon.com: RAM Mounts RAP-404-202U Tough-Claw Medium Clamp Double Ball Mount with Round Plate with Medium Arm for Rails 1" to 1.875" in Diameter : Electronics
Amazon.com: RAM Mounts RAM-B-230U Double Ball Adapter Compatible with RAM B Size Components : Electronics
RAM® Universal Double Ball Mount with Two Round Plates - B Size Medium – RAM Mounts
RAM® Double Ball Mount with Round Plate and 2" x 4" Plate - Short – RAM Mounts
Amazon.com: RAM Mounts Handlebar U-Bolt Double Ball Mount RAM-B-149ZU with Medium Arm for Rails .5" to 1.25" in Diameter : Electronics
RAM® Double Ball Mount with Round Plate and 2" x 2.5" Plate – RAM Mounts
RAM MOUNTS Composite Drill-Down Double Ball Mount RAP-B-141U-A
Ram Mount Double Ball Adapter RAM-230U
RAM® Double Socket Arm - B Size Long – RAM Mounts
RAM Arm Double 1 Inch Ball Adapter | Aircraft Spruce