How-To: Now's the right time to swap your old iMac's hard drive for a fast new SSD - 9to5Mac
OWC SSD Upgrade Kits for 27-Inch iMac 2011
SSD Drive SATA Data HDD Cable for iMac 27\" A1312 593-1330 Mid 2011 922-9875 | eBay
Install 3 hard drives on iMac 2011 27" FAILED ... | MacRumors Forums
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