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
How To Upgrade/Replace Mid-2011 iMac 21.5" Hard Drive To an SSD! - YouTube
Apple iMac 21.5" desktop All-in-one A1311 Mid 2011 i5 2.5GHZ 8GB 256GB SSD FAST | eBay
I recently purchased 2011 21.5 iMac (Mid-2011) and I'm obsessed. : r/mac