OWC Internal SSD DIY Kit for Apple iMac 21.5" OWCDIDIM21SSD11
1 TB SSD Upgradekit iMac 21.5" A1311 / iMac 27" A1312 Mid und Late 2011 | Comtecshop24.net
Amazon.com: OWC SSD Upgrade Kit for 2011 21.5-inch iMacs, Mercury Electra 250GB 6G SSD, 18" SATA III 6Gbps Data Cable, Installation Tools and iMac Screen Adhesive Tape Set : Electronics
Apple iMac 21.5" Core i5 8GB 512GB SSD OS X Mojave - Upgraded Model / Very Good | eBay