HP guide description: "Base enclosure (includes RJ-45 door with spring) For use only on HP EliteBook 840 G2 Notebook PC and HP EliteBook 740 G2 Notebook PC computer models". OEM documentation only; not bench-tested.
Source notes
HP EliteBook 840 G2 Notebook PC / HP EliteBook 740 G2 Notebook PC / HP ZBook 14 G2 Mobile Workstation Maintenance and Service Guide, printed p45 (PDF p55): "779684-001".