Amazon.com: ARKON Mounts Car or Truck Seat Rail or Floor Mount for Metal 20.6mm Ball to 4 Hole AMPS Pattern Adapter Arkon Mounts Arkon GN092 L28 AMPS Car or Truck Seat Rail Mounting Pedestal with Gooseneck and 4 Hole AMPS Head (sku 43131) Car Seat Rail or Floor Mount with 22" Gooseneck and AMPS Head for Sate Robust Car Headrest Mount with Metal 4 Hole AMPS Head and Security Har. Product Features: Strong yet flexible aluminium mount recommended for service vehicles and trucks Compatible with GPS, cameras, and other devices having a 4 Hole AMPS pattern 28 inch gooseneck and swivel ball provide ideal positioning of device Product Details: The GN092 L28 AMPS car or truck seat rail mounting pedestal can be used as a replacement, upgrade, or as an addition to an existing pedestal. It is compatible with Arkon's Slim Grip Universal Tablet Holder (TAB001 AMPS), as well as devices having a 4 Hole AMPS pattern, including vehicle specific mounts (VSMs), cameras, GPS devices, audio video receivers, or satellite radios including Sirius S50, Sirius XM Onyx Plus, XM Onyx EZ, Sirius XM Lynx, Stratus 7, Dock & Play, and Sirius Dock & Play (sold separately). This mounting pedestal is also ideal for mobile radio holders, housings, and other devices used by public safety, construction, and utility applications. Formerly an industry standard, the 4 Hole AMPS pattern consists of four holes located in a rectangular pattern spaced at 30. 17mm by 38. 05mm (measured as the centre to centre distance between holes). The car seat rail mount is made of strong yet flexible aluminium, and is ideal for service vehicles, trucks, or those who need easy access to their devices but prefer mounting them somewhere other than the windshield or dashboard. Use a socket wrench to install the mount to the car's seat rail. Loosen the passenger seat track bolt, insert the included seat track bolt bracket (2 different brackets are included for various seat rail configurations), and then retighten the bolt. Bend the 28'' gooseneck and rotate the swivel ball adapter head for 360 degree rotation for exact positioning of the device.