2013 iMac teardowns reveal SSD slots, soldered-in CPU in the 21.5” model | Ars Technica
New 2TB SSD in the iMac! Upgrade kit from OWC is awesome! : r/mac
ACASIS 10Gbps to Mac SSD Enclosure for Apple MacBook Air Pro, iMac from 2013 to 2017 Flash 12+16 PIN SSD Compatible with M.2 Nvme SSD with Adapter, Mac3W - Walmart.com
iMac SSD or HDD Upgrades - Florida | Fix Apple Now