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Amazon.com : SmallRig Drop-in Baseplate for Manfrotto 501PL Style with Anti-Falling and Width Adjustable Design - 2887 : Electronics
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Manfrotto plate 501-L90A Digital Camera Sliding Quick Release Plate For Manfrotto Tripod head 501HDV 503HDV 701HDV MH055M0-Q5 - AliExpress
Manfrotto 577 Rapid Connect Adapter with Sliding Mounting 577
CAMVATE Manfrotto-Style Quick Release Plate with 15mm C2447 B&H
Amazon.com : SMALLRIG Quick Dovetail Base Plate for Manfrotto 501 Tripod Fluid Head (New Version) - 1280C : Electronics