This SKU covers the following 21.5-inch Intel iMac models:
EMC 2308 21.5 inch iMac (Late 2009, Aluminum):
MB950LL/A ; 3.06 GHz (E7600) Core 2 Duo/ 500GB HD ; A1311 ; EMC 2308; iMac10,1
EEE Code: 9GW .
661-5305 (Integrated Graphics) .
EMC 2308 21.5 inch iMac (Late 2009, Aluminum):
MB950LL/A ; 3.06 GHz (E7600) Core 2 Duo/ 500GB HD ; A1311 ; EMC 2308; iMac10,1
EEE Code: 9RW .
661-5420 (MXM Graphics) .
EMC 2308 21.5 inch iMac (Late 2009, Aluminum):
MC413LL/A ; 3.33 GHz (E8600) Core 2 Duo/1TB HD ; A1311 ; EMC 2308; iMac10,1
EEE Code: 9RV .
661-5306 (Integrated Graphics) .
EMC 2308 21.5 inch iMac (Late 2009, Aluminum):
MC413LL/A ; 3.33 GHz (E8600) Core 2 Duo/1TB HD ; A1311 ; EMC 2308; iMac10,1
EEE Code: BZT .
661-5307 (MXM Graphics) .
EMC 2389 21.5 inch iMac (Mid 2010, Aluminum):
MC508LL/A ; 3.06 GHz (i3) Core i3 ; A1311 ; EMC 2389; iMac11,2
EEE Code: DCJN .
661-5534 .
EMC 2389 21.5 inch iMac (Mid 2010, Aluminum):
MC509LL/A ; 3.2 GHz Core i3 ; A1311 ; EMC 2389; iMac11,2
EEE Code: DC77 .
661-5538 .
EMC 2389 21.5 inch iMac (Mid 2010, Aluminum):
MC509LL/A/CTO ; 3.6 GHz Core i5 ; A1311 ; EMC 2389; iMac11,2
EEE Code: DCT7 .
661-5596 .
EMC 2428 21.5 inch iMac (Mid 2011, Aluminum):
iMC309LL/A ; 2.5 GHz Core i5 ; A1311 ; EMC 2428 ; iMac12,1
EEE Code: DJWK, DM66, DNJK .
661-5935 .
EMC 2428 21.5 inch iMac (Mid 2011, Aluminum):
MC812LL/A ; 2.7 GHz Core i5 ; A1311 ; EMC 2428 ; iMac12,1
EEE Code: DKG1, DM65, DNJJ .
661-5936 .
EMC 2428 21.5 inch iMac (Mid 2011, Aluminum):
MC812LL/A/CTO ; 2.8 GHz Core i7 ; A1311 ; EMC 2428 ; iMac12,1
EEE Code: DKG2 , DM67 , DNJL .
661-5937 .
EMC 2544 21.5 inch iMac (Late 2011, Aluminum):
MC978LL/A ; 3.1 GHz Core i3 ; A1311 ; EMC 2544 ; iMac12,1
EEE Code: DNY3, DP00 .
661-6024 .
EMC 2544 21.5 inch iMac (Late 2012, Aluminum):
MD093LL/A ; 2.7 GHz Core i5 ; A1418 ; EMC 2544 ; iMac13,1
EMC 2544 21.5 inch iMac (Late 2012, Aluminum):
MD094LL/A ; 2.9 GHz Core i5 ; A1418 ; EMC 2544 ; iMac13,1
EMC 2544 21.5 inch iMac (Late 2012, Aluminum):
MD094LL/A/CTO ; 3.1 GHz Core i7 ; A1418 ; EMC 2544 ; iMac13,1
EMC 2544 21.5 inch iMac (Early 2013, Aluminum):
ME699LL/A; 3.3 GHz Core i3 ; A1418 ; EMC 2544 ; iMac13,1
Note: While GALAXY specializes in iMac component level repair we also offer replacement service parts for "self-install". You will find a list of popularly requested items here -> iMac Service Parts 
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