OWC SSD Upgrade Kit For 2010 27-inch iMacs, OWC Mercury Electra 250GB 6G SSD, 18" SATA III 6Gbps data cable, SSD Power Cable, Installation tools and iMac screen adhesive tape set :
iMac (circa 2009) Hard Drive to SSD Upgrade - YouTube
iMac Hard Drive Upgrade to SSD - Your local Apple Repair Specialists
Apple iMac Mid2010 (21.5-inch) A1311 HDDからSSDへ換装。 | PCサポートフィールド
iMac Repair & Upgrade, Same Day Services
iMac SSD Upgrade with 1TB Samsung 860 EVO - YouTube
iMac 2010 upgrade met een SSD
iMac Mid-2010 27 inch (A1312) SSD and RAM disassembly and upgrade - Much FASTER! - YouTube