HP lists this spare part number for the HP ZBook 15 G3 in its Maintenance and Service Guide (printed p.19).
Source notes
HP Maintenance and Service Guide for the HP ZBook 15 G3, spare parts table, printed p.19: "256-GB, PCIe, Samsung*, locked 917488-001". Read from the cached HP manual (via FDY-MM-016-H3). *Component maker as listed by HP in its parts documentation. LPF is not affiliated with or endorsed by Samsung.