Ergotron Mounting Adapter for Mounting Arm – Anodized Silver – Anodized Silver
This fixed rotation kit with two stop posts controls the range of motion of the LX arm, so the extension doesn’t come in contact with a desk panel or divider on either side of the post.

Ergotron 98-060-003

Features

Provides a fixed 180-degree stop

Prevents the extension arms from hitting the wall

Easily attaches to the pole and secured in place with two set screws to prevent stop rotation