The APAMPS25MM adapter converts your 1 inch / 25mm mount into a 4-Hole AMPS mount (mounts, holders, and devices sold separately).  This adapter can be used on the base or at the head for attachment to a cradle or device.

Mount 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).