Adamanta 16GB (2x8GB) Apple Memory Upgrade DDR3L 1600MHz SODIMM Compatible for iMac (Mid 2011, Late 2012, Early/Late 2013, Late 2014, Mid 2015), MacBook Pro (Early/Late 2011, Mid 2012), Mac Mini RAM at Amazon.com
Apple iMac 14,1 - 21.5" 2013 - Core i5-4570R @ 2.70GHz 16GB RAM 1TB HDD - Good | eBay
How to Upgrade iMac RAM: 2012-2022: EveryMac.com
iMac (21.5-inch, Late 2013) - Technical Specifications
iMac 14,1 (21.5-inch, Late 2013)
Memory Upgrades for iMac 21.5-Inch 2012 - Late 2013
Apple iMac 2013 (Late) 21.5-inch (iMac 14,3) SSD ,Ram & OSX Upgrades - ZD Laptop Service Centre
16GB Kit (2 x 8GB) PC3-12800 RAM for Apple iMac Late 2013 - 27 Inch MF125LL/A Memory Upgrade Kit
Refurbished Apple iMac 21.5-Inch, Intel Quad Core i5-4570R, 1TB HDD, 8GB RAM, Intel Pro 5200, C (Late - 2013) | Mac4sale
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OWC 16GB (2x8GB) ram Upgrade PC3-12800 DDR3L 1600MHz sodimm 204 Pin CL11 Memory Upgrade Kit Compatible with Late iMac, Mac Mini, and MacBook Pro Computer at Amazon.com