Manfrotto 501PL Sliding Quick Release Plate with 1/4"-20 501PL
Amazon.com : Manfrotto 501PLONG Video Long Rapid Connect Mounting Plate,Black : Tripod Camera Mounts : Electronics
SmallRig Quick Release Plate (Manfrotto 501PL style ) DSLR Camera Plate 2900 – Photo Camera Store
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
Dodd Camera - BENRO QR6 Quick Release Plate for S4/S6 and Manfrotto 501PL