Amazon.com: OWC SSD Upgrade Kit for 2011 21.5-inch iMacs, Mercury Electra 1.0TB 6G SSD, 18" SATA III 6Gbps Data Cable, Installation Tools and iMac Screen Adhesive Tape Set : Electronics
I recently purchased 2011 21.5 iMac (Mid-2011) and I'm obsessed. : r/mac
Identify your iMac model - Apple Support
Apple iMac 21.5-inch Mid 2010 3.06GHz Intel Core i3 (MC508LL/A) – UNICOM, Inc.