Apple iMac 2013 (Late) 21.5-inch (iMac 14,3) SSD ,Ram & OSX Upgrades - ZD Laptop Service Centre
Memory upgrade: Apple iMac 2012/2013/2014 (Howto)
SSD For iMac 21.5-Inch (Late 2013 - 2019) - Macfixit Australia
Upgrade RAM Apple iMac 21.5 slim A1418
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A-Tech 8GB RAM for Apple MacBook Pro (Mid 2012), iMac (Late 2012, Early/Late 2013, Late 2014, Mid 2015), Mac Mini (Late 2012) | DDR3 1600MHz PC3-12800 SODIMM 204-Pin Memory Upgrade at Amazon.com
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Memory Upgrades for iMac 21.5-Inch 2012 - Late 2013