This replacement Garmin insert is intended for the Bup Mk II Garmin arms. The compatible mount arm will have screws that insert from the back through two holes in the mount arm. These holes are 20 mm apart. This insert is identical to the stock quarter-turn insert included with the stock Garmin Varia mount or computer mounts.
These inserts are intended to break when too much torque is applied. For example, this would happen if someone grabbed the Varia and tried to pull it up and out of the mount without releasing it first.
Includes the insert and two M3 x 8 mm screws for Bup Garmin Mk II mount arms.