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
iMac 27" 2013 SSD upgrade - IT-Tech Online
SATA Blade SSD Module - Dual SSD Drive Kit for iMac 27 Inch 2012 Model - Walmart.com
iMac 5K - 4790K, M295X - thermal compound + second SSD upgrade + Air Vents MOD | MacRumors Forums
Apple iMac 27" (Mid 2020) with Intel i5, Six Core, Retina 5K Display, 8GB RAM, 256GB SSD, Radeon Pro 570x, Mac OS - Silver | P.C. Richard & Son
Upgrading a 27-inch iMac 5K to 14 terabytes - Replacing the Fusion Drive with both a SSD and an harddisk