How-To: Now's the right time to swap your old iMac's hard drive for a fast new SSD - 9to5Mac
Amazon.com: OWC Internal SSD DIY Kit for All Apple 27" iMac 2011 Models : Electronics
Amazon.com: OWC SSD Upgrade Kit for 2011 21.5-inch iMacs, Mercury Electra 500GB 6G SSD, 18" SATA III 6Gbps Data Cable, Installation Tools and iMac Screen Adhesive Tape Set : Electronics
Internal SSD Cable Upgrade Kit for Apple 21.5 Inch iMac 2011 Models - Walmart.com
2011 imac 27" 32GB - final stage of 1TB + 2TB SSD upgrade (replaced HDD & optic drive). Also cleaned out the fans and case. Running 'SSD Fan Control' & 'Macs Fan