How to Upgrade/Replace the PCIe SSD in a 21.5-inch iMac 2019 (iMac19,2) - YouTube
Opened up 2012 21.5 iMac for SSD upgrade. | MacRumors Forums
Amazon.com: OWC 2.0TB SSD Upgrade Kit for 2011 21.5-inch iMacs, 2.0TB 6G SSD, 18" SATA III 6Gbps Data Cable, Installation Tools and iMac Screen Adhesive Tape Set : Electronics
Apple iMac 21.5-inch A1418 SSD upgrade / vervanging 2TB - Appleparts, de Apple specialist van Nederland.