The HP N19007-001 LCD back cover sponge is a spare part for the display assembly of the HP 250RT 15.6-inch G9 Notebook PC. HP’s parts catalog identifies this number specifically for the display back cover sponge.
It is listed as a separate part from the M31083-001 display back cover, so it is the sponge component rather than the complete cover assembly. This identification makes the part useful for servicing the display assembly when that specific component needs replacement.