Original 512GB SSD MZ-JPU512T/0A6 For Apple iMac 21.5-inch A1418 Retina(Late 2013 – Late 2015), iMac 27-inch A1419 Retina(Late 2013 – Late 2015), Mac mini (Late 2014), Mac Pro (Late 2013), MacBook Air
DIY Bundle - 1TB OWC 6G SSD and HDD Kit for 21.5-Inch iMac
APPLE iMAC i7 21.5" Late 2013 16 GB RAM 1TB HDD 128 GB SSD 3.1 GHZ NVIDIA GT | eBay
FATHER'S SPECIAL Imac - (21.5'' - LATE 2013) - I5, 16GB, 256GB-SSD, NV – Ordinateur St Joseph
Apple iMac 21.5-inch and 27-inch (Late 2013) reviews | Macworld
Apple iMac 21.5” SSD Upgrade (2013-2015) HDD To Solid State Drive (SATA) | Step By Step - YouTube
OWC Aura SSD Install: 21.5-inch iMac Late 2012 – Early 2013 - YouTube
I got a FREE 2013 iMac 21.5 with internal upgrades including Samsung evo ssd and 16gigs of ram. Then used open legacy patcher to install Mac OS Venture 13.5 beta. : r/osx
Amazon.com: OWC 1TB Aura Pro X2 NVMe SSD Upgrade Kit Compatible with Select 27" and 21.5" iMac Models (Late 2013 - Current) : Electronics