How to Install/Upgrade the PCIe SSD in a 27-inch iMac (2019) iMac19,1 - YouTube
maxupgrades.com: Single SSD Drives kit for iMac 27 inch 2012 Models with SATA Blade SSD Module / Heatsink/ Power Cable and DATA Cables for [SSD + HDD] with iMac Adhesive LCD Tape