This adapter plate has 1 "T" shaped prong extending out from the base plate. Fits many devices with "Single-T" slots. The Single-T system is used by many GPS's and other devices. NOTE: Some devices use 2 T-prongs. If you have this, please select the 2 T-prong Vehicle Adapter from the drop down. If you are not sure what you have, just unhook your device from the suction cup mount and you can easily see if you have a 1 prong or 2 prong T extending from the mount.