Apple Computer , iMac 21.5-inch 2.5/2.7 Core i5 (i5-2400S, i5-2500S), iMac 21.5-inch 2.8 Ghz Core i7 (i7-2600S),
Order Number, MC309LL/A,
Model Number, A1225,
Model Year, Mid 2011,
Part Name, AirPort Card (Japan),
Manufacture Part Number, N/A,
Compatible Apple Order Number, MC309LL/A, MC812LL/A,
Compatible Apple Model Number, A1311,
EMC Number, EMC 2428,
EEE Code, DDV3,
Compatible Apple Computer, iMac (21.5-inch, Mid 2011), ,
Order you product here:
j661-5946 Airport Card (Japan) for iMac 21.5 inch Mid 2011 A1225 MC309LL/A,
j661-5946
source
http://info.applepartsellers.com/j661-5946-airport-card-japan-for-imac-21-5-inch-mid-2011-a1225-mc309ll-a