922-9805 Pressure Wall, Backlight - Mid 2011, Late 2011 - A1311 21.5inch iMac NB-3159W
This is a replacement backlight pressure wall bracket for the 21.5-inch iMac.
Apple part number: 922-9805
922-9805 Pressure Wall, Backlight - Mid 2011, Late 2011 - A1311 21.5inch iMac