OWC - In-line Digital Thermal Sensor Cable for upgrading the Hard Drive in 27-inch & 21.5-inch iMac (2011) models : Amazon.co.uk: Computers & Accessories
How to replace an iMac 2011 HDD to an SSD
DIY Bundle - 1TB OWC 6G SSD and HDD Kit for 21.5-inch iMac
iMac 2011 27" Apple stock SSD swap | MacRumors Forums
Mid-2011 27 inch iMac How to Replace Hard Drive with SSD (Short Version) #2011iMac #j2review
OWC SSD Upgrade Kits For 27-Inch IMac 2011, 51% OFF
OWC SSD Upgrade Kits for 27-Inch iMac 2011
OWCDIDIM21SSD11, OWC Internal SSD DIY Kit, For All Apple 21.5" iMac 2011 Models, iMac to SSD SATA 6Gb/s cable, iMac to SSD power cable, Thermal safe adhesive mounting set | EET