Amazon.com : Manfrotto 501PLONG Video Long Rapid Connect Mounting Plate,Black : Tripod Camera Mounts : Electronics
Dodd Camera - SMALLRIG Counterweight Mounting Plate (Manfrotto 501PL) for DJI-R-S
Dodd Camera - SmallRig Baseplate for BMDPCC 4K&6K Manfrotto 501PL Compatible
Manfrotto 577 Rapid Connect Adapter with Sliding Mounting Plate (501PL - The Camera Exchange
Amazon.com : PM501 Manfrotto Type Quick Release Plate with Arca Swiss Type Clamp Built in Compatible with 501PL / RC3 / RC5 / NG Heads Features ProMediaGear Strap Port, for Video Heads