OWC SSD DIY Kit for All Apple 27-inch iMac 2011 Models
Amazon.com: OWC in-Line Digital Thermal Sensor HDD Upgrade Cable for iMac 2011, (OWCDIDIMACHDD11) : Electronics
How to Upgrade iMac Hard Drive (2009, 2010, 2011): EveryMac.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