3.68 Inch Dia. Base Plate with Standard Sized Arm and Raymarine Chartplotter Mounting Plate with 2.25" Dia. D Sized Ball
Price: $170.99
RAM Handle Wrench for "D" Sized Ball Arms & Mounts (RAM-D-201U Series Arms)
Price: $29.49
RAM LARGE Cable Manager for 2.25 Inch (RAM-D-202U) Diameter Ball Bases
Price: $23.49
RAM Mixed Combination Pin-Lock Security Nut and Key Knob for "D" 2.25 Inch and "E" 3.38" Inch Diameter Sized Arms
Price: $9.49