Why do you need a Docking Spacer? If you encounter issues when docking your system and your system’s docking connector is towards the backend, then you must install the docking spacer on the port replicator.n How to install the docking spacer? Place the docking spacer on the port replicator, until the docking spacer clicks into place.n Compatibility List Systemsn- Latitude 7240n- Latitude 7440n- Port Replicatorn- Dell Advanced E‐Port II Replicatorn- Dell Simple E‐Port II Replicatorn The docking connector for most of the Latitude E‐series systems is towards the middle of the system’s backend. But, for specific Latitude notebooks, the docking connector is located towards the edge of the backend of the system. Docking spacer is required to dock your system in the right position. This product is tested and validated with Dell systems and port replicators. It is recommended that you use the docking spacer only for systems mentioned in the compatibility list.