OWC DIY Kit for all 2012 - Mid 2019 27" iMac's... at MacSales.com
Apple iMac (27-inch, 2019) | TechRadar
How to upgrade iMac 2019 from fusion HDD to SSD (4k) - YouTube
How to Upgrade/Replace the PCIe SSD in a 21.5-in iMac (2019)
How to Install/Upgrade the PCIe SSD in a 27-inch iMac (2019) on Vimeo
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