The RAM-B-238-XM1U consists of a 1" ball and diamond plate which contains a double hole spacing of 1.91 inches (48.5mm). Included is hardware that will attach directly to the back of your Delphi or Sirius radio.
RAM® Double Socket Arm with Round Plate
RAM® Handlebar U-Bolt Base with Double Socket Arm
RAM® Tough-Claw™ Small Clamp Base with Double Socket Arm
RAM® Twist-Lock™ Suction Cup Base with Double Socket Arm
RAM® Double Socket Arm with Diamond Plate
RAM® Diamond Ball Base
RAM® Hardware Pack for XM Radio