SSD Upgrade Kits for 27-Inch iMac (2012 - Early 2013)
Apple 27 iMac Teardown, SSD Hack and 2TB Upgrade – gerrysweeney.com
OWC SSD Upgrade Kit For 2010 27-inch iMacs, OWC Mercury Electra 250GB 6G SSD, 18" SATA III 6Gbps data cable, SSD Power Cable, Installation tools and iMac screen adhesive tape set :
maxupgrades.com: Dual SSD Drives kit for iMac 27 inch 2012 Models with Blade SSD Module with Heatsink and Power and DATA Cables
Imac 27 inch a1312 SSD installation - Computer Repair- Overnight PC & MAC Repair Los Angeles
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
SSD Upgrades for Apple iMac 27-Inch Late 2013 - 2019