OWC SSD Upgrade Kits for 21.5-Inch iMac (2013 - 2019)
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
NVME 512GB SSD For Apple iMac 21.5 A1418 EMC 2638 Late 2013 3 Years Warranty | eBay