iMac Intel 21.5" A1418 and A2116 (2012-2019) Adhesive Strips
OWC 16GB (2 x 8GB) PC21300 DDR4 2666MHz SO-DIMMs Memory Compatible with Mac Mini 2018, iMac 2019 and up, and Compatible PCs (OWC2666DDR4S16P) at Amazon.com
Memory Upgrades for iMac 21.5-Inch 2012 - Late 2013
16GB -2x8GB Memory Ram Upgrade 21.5" Apple iMac-14.1 Core i5 2.7GHz Late 2013 | eBay
Memory Upgrades for iMac 21.5-Inch 2012 - Late 2013
iMac Late 2013 Upgrade in 2020 CPU Ssd Ram MAX Out ... Worth it? | Shades Of Tech ⬡ - YouTube
SOLVED: Need more ram for iMac 21.5 late 2013 - iMac Intel 21.5" EMC 2638 - iFixit
HOW I UPGRADED MY iMAC 21.5in Late 2013 MODEL (SSD & RAM UPGRADE) - YouTube
Memory Upgrades for iMac 21.5-Inch 2012 - Late 2013
late 2013 imac proccesor upgrade help | MacRumors Forums
How to Upgrade iMac RAM: 2012-2022: EveryMac.com
Apple iMac 21.5" Late 2013 Core i5 8GB RAM 250gb SSD - VESA Mount Only NO STAND | eBay
Install memory in an iMac - Apple Support
A-Tech 8GB Kit (2x4GB) 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
Configure your own 21.5-inch Apple iMac (2013) at OWC
Install memory in an iMac - Apple Support
Apple's new 'Assembled in USA' iMac a bear to upgrade, repair • The Register