Amazon.com : CAMVATE Quick Release Base Plate Compatible with Manfrotto 501/504/ 577/701 Tripod Standard Accessory - 1419 : Electronics
Amazon.com : Fotga Rapid Camera Quick Release Sliding Plate 501PL Replacement with 1/4" and 3/8" Mounting Screws for Manfrotto 501HDV 503HDV 701HDV MH055M0-Q5 Ball Head : Electronics
Amazon.com : NICEYRIG Quick Release Base Plate Compatible with Manfrotto 577, 501, 504, 701 for DSLR Camera 15mm Rail Support System : Electronics
Amazon.com : NICEYRIG Quick Release Clamp for ARCA Swiss Standard, with Bottom Plate for Manfrotto 577/501/504/701, Gimbal Tripod Switch Adapter for RS2/RSC2/Ronin S, Zhiyun Crane 2S/Weebill Lab - 394 : Electronics
Amazon.com : Haoge CP-MA90 Quick Release Plate QR Clamp Adapter Convertor for Select Manfrotto Tripod Fluid Video Head to Arca-Swiss Compatible, Fit 501PL / Q5 / 504PLONG / 500PLONG Heads : Electronics
Amazon.com : SmallRig Drop-in Baseplate for Manfrotto 501PL Style with Anti-Falling and Width Adjustable Design - 2887 : Electronics
Amazon.com: NEEWER 501PL Tripod Fluid Head Quick Release Plate Compatible with Manfrotto MVH500AH MVH502AH, Camera Mounting Plate with 1/4" and 3/8" Screws, Anti Off Pin for GM001 GM002 GM006 Fluid Heads, QR5 :
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
Amazon.com : CAMVATE Quick Release Mount Base QR Plate for Manfrotto 501/504/ 577/701 Tripod Standard Accessory(Black) - 1437 : Electronics
Amazon.com: Neewer Professional Aluminium Alloy Quick Release Adapter and Plate with 1/4" and 3/8" Screws for Manfrotto 501HDV, 503HDV, 701HDV, 577/519/561/Q5 DSLR Cameras : Electronics
Amazon.com : CAMVATE Quick Release Base Plate Compatible with Manfrotto 501/504/ 577/701 Tripod Standard Accessory - 1419 : Electronics
Amazon.com : SmallRig V-Mount Battery Plate with Quick Release Plate for Manfrotto 501, 15mm Rod Clamp, wireless receiver mounting bracket, L-Shape Compact & Foldable V Mount Battery Plate for Cinema Camera -
Amazon.com : Neewer 75mm Bowl Adapter, Metal Half Ball Flat to Bowl Adapter Convert with 3/8-inch Screws Mount on Tripod and Fluid Head for Neewer TA60/2500/3500, Manfrotto 501/502/504 : Electronics
Amazon.com: FALCAM F50 Long Quick Release Base Mount, Camera Mounting Adapter QR System, Aluminum Camera Accessory for Filmmaker & Photographer, Compatible with Manfrotto 501 Size QR Plate (Base Mount Only) : Electronics
Amazon.com: NEEWER 501PL Tripod Fluid Head Quick Release Plate Compatible with Manfrotto MVH500AH MVH502AH, Camera Mounting Plate with 1/4" and 3/8" Screws, Anti Off Pin for GM001 GM002 GM006 Fluid Heads, QR5 :
Amazon.com: Manfrotto Long Rapid Connect Mounting Plate for The 501, 503 & 505 Pro Video Fluid Heads : Movies & TV
Amazon.com : Manfrotto 577 Rapid Connect Adapter with Sliding Mounting Plate for Bogen/Manfrotto Tripods : Manfrotto Quick Release : Electronics