iMac 21.5-inch with Retina 4K and non-Retina (2019)
How to Upgrade or Install a PCIe SSD in a 21.5-inch Apple iMac (2019)
OWC's step-by-step video of how to upgrade or install a PCIe SSD in a 21.5-inch Apple iMac (2019).
OWC Skill Level:
Professional Installation Recommended Contact Customer Service
How to find your Mac's Model ID