LEZYNE GPS Bar/Stem Mount Kit Enter your 1-GPS-ORMCMK-V104 number Above to make sure this fits Included are two sets of o-rings (two diameters), Plus a backup O-ring in each size, a rubber shim and an x-lock composite mounting bracket The rubber shim supports the x-lock mount which is engineered to attach at any 9 degree Angle and still allow the computer to be mounted forward The x-lock securely fastens the GPS computer to the mount by pressing down at a 45 degree Angle and rotating it forward until it "locks" into place