RAM® Handlebar U-Bolt Mount for Garmin Astro 320, GPSMAP 62 & 64 Series RAM-202S 5" rectangular base that has

5" rectangular base that has pre-drilled holes at each corner of the base plate and composite backer plate

The RAM-B-153 consists of a medium length B-size arm

when tightened

The RAM-B-108B-A-237U consists of a short length B size arm with a 1/4"-20 threaded post and a strap clamp base for rails from 1" to 2

RAM® Handlebar U-Bolt Mount for Garmin Astro 320, GPSMAP 62 & 64 Series RAM-202S 5" rectangular base that hasThe RAM B 149Z GA41U consists of a zinc coated U bolt base, medium length double socket arm, and high strength composite cradle with diamond ball base. Included in this kit is hardware that will accommodate rails from 0. 5" to 1. 25" in diameter. The base includes black cover caps to be placed over the exposed ends of the U bolt. The included composite rail adapter can narrow the rail to a minimum width of 0. 5". The mount is designed with a B size 1"