922-7584 A1181 Left Clutch Block - 13-inch Macbook, 1.83-2GHz, Core Duo, MA254LL/A NB-1751W This is a left clutch block for the A1181 MacBook 13" models released in Mid 2006. This is the metal piece that is used to screw the display hinge into the base of the machine. Apple part number: 922-7584