IMac 21.5" 27" A1311 A1312 SD Card Reader Board. 85a iMac 27" Late 2009 A1312 EMC 2309 iMac10,1. 85b iMac 27" Late 2009 A1312 EMC 2374 iMac11,1. 85c iMac 27" Mid 2010 A1312 EMC 2390 iMac11,3. 85d iMac 27" Mid 2011 A1312 EMC 2429 iMac12,2.
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