Quick Release Plate Converter Clamp Adapter for Arca-Swiss Fit Plate Manfrotto 200PL/410PL Plate & Sachtler 6T/8T/10T Fluid Head - AliExpress
S.C.V. Photography Ideas: Manfrotto MHXPRO-3W Arca Compatible Conversion Set from Hejnar PHOTO
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