The diamond-shaped metal 25mm ball to 2-Hole AMPS-compatible adapter is a great alternative for tight locations where a square or circular adapter won't work. The adapter is compatible with 25mm (1 inch) mounts and pedestals, including those from Arkon or RAM Mounts. (Mounts, holders, and devices sold separately.) The adapter's metal construction provides a sturdy connection for drilling into dashboards or other solid, flat surfaces, ideal for commercial or fleet use. The 2-Hole base plate fits many AMPS pattern devices, with the distance between the 2 holes measuring approximately 1.91" (48mm) center-to-center.
 
APD2MAMPS25