HP ProBook 450 G8 Maintenance And Service Manual page 60

c. Rotate the display panel over and place it next to the display enclosure (3).
Display panels are available as the following spare part numbers:
M21739-001: FHD, 1000 nit, privacy panel
M22541-001: FHD, 400 nit panel
M31023-001: FHD, 400 nit panel, locked
M21736-001: HD, SVA, 250 nits
M21737-001: FHD, UWVA, 250 nits
M21738-001: FHD, UWVA, 250 nits, TOP (Touch-on Panel)
M31021-001: FHD, UWVA, 250 nits, locked
52 Chapter 5 Removal and replacement procedures for authorized service provider parts