RAM Form-Fit Cradle for Garmin nuvi Reservoir Mount with Diamond Plate

consists of a high strength composite cradle and hole pattern that will allow the attachment to all RAM components or mounts that contain the universal AMPs hole pattern. Compatible and interchangeable with a wide range of popular RAM Mounting products, this cradle is ready to compliment your GPS and become the most useful accessory in your vehicle. Included is a set of two nuts and bolts to connect the cradle to any RAM components or mounts that contain the universal AMPs hole pattern.

This also includes a sealed reservoir mount with diamond plate .I'm not sure of the size but it was purchased with the mount