65mm75mm Tripod Head Bowl Riser,half Ball Flat To Bowl Adapter Converter For Manfrotto Video Camera Tripod Fluid Head Slider - Photo Studio Kits - AliExpress
Amazon.com : Manfrotto 088LBP Adapter 1/4-Inch- 20 to 3/8-Inch with flange, Nickel : Tripod Accessories : Electronics