The docking connector for most of the latitude series systems is towards the middle of the system's back end. But, for specific Latitude notebooks, the docking connector is located towards the edge of the back end 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.