RAM 3.68" Dia Round Plate with 2.25" Ball (RAM-D-202U)
RAM D Size Ball Short Length Socket Arm (RAM-D-201U-C)
RAM Medium Length Socket Arm for D Size 2.25" Balls (RAM-D-201U)
RAM U-Bolt Base with D Size Ball for Rails (RAM-D-235U)
RAM D Size Ball Mount with 2 Round Plate & Medium Arm (RAM-D-101U)