821-1312-A 922-9780 Cable, Airport/Bluetooth Flex - Early Late 2011 - A1278 13inch MacBook Pro NB-4176W
This is the Airport Card Flex Cable for the MacBook Pro 13" Unibody.
Apple part number: 922-9780, 821-1312-A
922-9780 Cable, Airport/Bluetooth Flex - Early Late 2011 - A1278 13inch MacBook Pro 8211312A