How Do I Determine The Logic Board Replacement Part Number For My Mac Imac Intel 27 Emc 2546

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I need to replace the logic board on my late 2012 Mac. I have all the specs on it, but don’t know the exact part for the logic board. I’m afraid I’m going to order the wrong thing. iMac “Core i7” 3.4Ghz 27" Late 2012 A1419 EMC 2546 Thanks!

Apple Part #: 661-7160 Manufacturer Part #: 820-3299 http://www.powerbookmedic.com/iMac-27-34… UPDATE iMac 27" 3.4GHz Logic Board, Quad-core i7, 1GB GDDR, Late 2012 Apple Part #: 661-7159 https://www.powerbookmedic.com/iMac-27-3…