The Garmin Street Pilot III - 2.5" Diameter Base Plate is suitable for Garmin 's Street Pilot III GPS Receiver, specifically designed to sit flush when attached to the Garmin's own Street Pilot II, III and GPSMAP 295 plastic cradle. Can also be used on Garmin SP2610, 2620, 2650 , 2660 plastic cradle with audio and power connections.