An External SSD Gave My iMac a New Lease on Life - TidBITS
SSD Upgrades for Apple iMac 27-Inch Late 2013 - Current
Slow disk speed - iMac 21.5", late 2013. Surely it should be faster? : r/osx
SSD Upgrades for Apple iMac 27-Inch Late 2013 - Current
Amazon.com: Sintech USB 3.0 External Case with USB 3.1 connetor, Compatible for 28Pin SSD from MacBook Air(Mid 2013-2016) and MacBook PRO(Late 2013 - Mid 2015),Not Fit MacBook PRO 2016-2019 Year : Electronics
OWC Envoy Pro External SSD Enclosure (Mid 2012 and Early 2013 Macs) - iFixit Store
iMac (27-inch, Late 2013) - Technical Specifications