meerson, specifically for the 922-9343 I get this compatibility:"
iMac 21.5" 2.5GHz Core i5 (A1311) - Mid 2011 MC309LL/A
iMac 21.5" 2.7GHz Core i5 (A1311) - Mid 2011 MC812LL/A
iMac 21.5" 2.8GHz Core i7 (A1311) - Mid 2011 MC812LL/A
iMac 21.5" 3.06GHz Core 2 Duo (A1311) - Late 2009 MB950LL/A
MC413LL/A
iMac 21.5" 3.06GHz Core i3 (A1311) - Mid 2010 MC508LL/A
iMac 21.5" 3.1GHz Core i3 (A1311) - Mid 2011 MC978LL/A
iMac 21.5" 3.2GHz Core i3 (A1311) - Mid 2010 MC509LL/A
iMac 21.5" 3.33GHz Core 2 Duo (A1311) - Late 2009 MB950LL/A
iMac 21.5" 3.6GHz Core i5 (A1311) - Mid 2010 MC508LL/A
from here. If you need anything more specific, let us know which part you have and where you would like to install it to:-). Hope this helps, good luck.