Apple Computer, iMac 21.5-inch 3.1 GHz Core i5 (4K) (i5-5675R), iMac 21.5-inch 3.3 GHz Core i7 (4K) (i7-5775R),
Order Number, MK452LL/A, BTO/CTO,
Model Number, A1418,
Model Year, Late 2015,
Part Name, Logic Board 3.3 GHz (16GB) - HDD,
Manufacture Part Number, N/A,
Compatible Order Number, MK452LL/A, BTO/CTO,
Compatible Model Number, A1418,
EMC Number, EMC 2833,
EEE Code, GQT4, GQT5, GQT6,
Compatible Apple Computer, iMac - 4K (21.5-inch, Late 2015), ,
Order you product here:
661-03281 Logic Board 3.3 GHz (16GB) HDD for iMac 21.5-inch Late 2015 A1418 MK452LL/A, BTO/CTO,
661-03281
source
http://blogs.applepartsellers.com/661-03281-logic-board-3-3-ghz-16gb-hdd-for-imac-21-5-inch-late-2015-a1418-mk452ll-a-bto-cto.html