A RAM-D-101 with one round plate replaced with a RAM-D-254 ball and small footprint plate.
(RAM-D-254U) 2.25" Ball with 6.2cm Dia Base
(RAM-D-202U-22) 55mm Ball on 2 x 2 Inch Plate
(RAM-D-247U-2) Aluminum Square Rail Clamp 2"
(RAM-D-111U) Clamp Rectangular Round Plates
(RAP-S-NUT5U) Pin-Lock Security Knob D-Size
(RAM-D-246U) Vesa Base 100 and 75mm
(RAM-D-230U) Double D-sized Ball Connector
(RAM-D-109HS-4U) Horizontal Swing Arm Mount with S
(RAM-D-247U-3) Aluminum Square Rail Clamp 3"