OWC SSD Upgrade Kit for 2011 21.5-inch iMacs, OWC Mercury Electra 250GB 6G SSD, 18 SATA III 6Gbps Data Cable, Installation Tools and iMac Screen Adhesive Tape Set: Buy Online at Best
Internal SSD Cable Upgrade Kit for Apple 21.5 Inch iMac 2011 Models | eBay
OWC In-line Digital Thermal Sensor for 27" & 21.5" iMac (2011) - Macfixit Australia