The RAM-D-202U-225 contains a 2.25" diameter rubber ball connected to a rectangular plate with a 4-hole pattern of 1.5" x 2" center to center.
RAM® Horizontal Swing Arm Mount with Single Socket Arm
RAM® Double Socket Arm
RAM® Vertical Swivel Mount with Socket Arm
RAM® Double Socket Arm with RAM® Pin-Lock™ Security Nut
RAM® Double Socket Arm with Jam Nut
RAM® Horizontal Swivel Mount with Socket Arm