OWC SSD Upgrade Kits for 21.5-Inch iMac (2013 - 2019)
How to Install/Upgrade the PCIe SSD in a 21.5-inch iMac (Mid 2017) iMac18,1 iMac18,2 - YouTube
2017 21.5" inch iMac A1418 SSD Hard Drive Replacement Upgrade Screen Removal - YouTube
Amazon.com: USB C 3.2 Gen2 MacBook SSD Enclosure for Apple Flash SSDs 12+16 PIN MacBook Pro MacBook Air Mac Pro iMac from 2013 to 2017, with Adapter to Support M.2 NVMe SSDs (
How to Upgrade iMac Pro SSD (Replace Storage): EveryMac.com
iMac (Retina 5K, 27-inch, 2017) CPU and NVME SSD Upgrade Pitfalls and Tips | Page 5 | MacRumors Forums