SmallRig Sony VCT-14 Shoulder Plate Manfrotto 501 Compatible QR Plate 1954B | eBay
BEXIN Quick Release Plate adapter mount Sliding 501PL Rapid Connect Base for Manfrotto 501 503 701 Q5 Camera Tripod Accessories - Price history & Review | AliExpress Seller - BEXIN Official Store | Alitools.io
Baseplate for Manfrotto 501 plate compatible with ARRI dovetail-Dongguan Lanparte Television Equipment Technology Co.,Ltd.
Amazon.com: Foto4easy 501PL Sliding Quick Release Plate QR for Manfrotto 501 503HDV 701HDV MH055M0-Q5 : Electronics
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Amazon.com : SMALLRIG Quick Dovetail Base Plate for Manfrotto 501 Tripod Fluid Head (New Version) - 1280C : Electronics
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SmallRig Manfrotto-Style Aluminum Drop-In Base Plate for Manfrotto 501 – JG Superstore