604-2713-A 922-9769 Speaker / Subwoofer, Right - 13inch MacBook Pro, A1278 Early Late 2011 NB-4120W
This is the right-side speaker / subwoofer assembly for the MacBook Pro 13".
Apple part number: 922-9769, 604-2713-A
922-9769 Speaker / Subwoofer, Right - 13inch MacBook Pro, A1278 Early Late 2011 6042713A