How to Upgrade/Replace the Memory in a 21.5-inch iMac (2019)
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
Apple iMac 2019 SSD vs Fusion Drive for Video Editing - Geeky Nerdy Techy
A list of successful iMac 27" (2012-2019) SSD upgrades | MacRumors Forums