12.7mm 2nd HDD SSD Hard Drive Optical bay Caddy Adapter for SuperDrive 27" 25" 21"
OWC SSD Upgrade Kits For 21.5-Inch iMac 2010
How to Install a 2.5-inch SSD in the SSD Drive Bay of a 27-inch iMac Mid 2010 (Updated) - YouTube
OWC Internal SSD DIY Add-On Kit with Tools (for 27" Apple iMac Mid-2010) | eBay
Amazon.com: 2nd HDD SSD Hard Drive Caddy for Apple iMac Mid-2010 A1311 MC508LL/A MC509LL/A MC508 MC509 21.5-Inch Desktop Computer, SATA 3 Second Solid State Drive Enclosure, CD DVD SuperDrive Optical Bay :
Amazon.com: OWC 1.0TB 3G SSD and HDD DIY Complete Bundle Upgrade Kit for Late 2009-2010 iMacs, (OWCKITIM09HE1TB) : Electronics
Finally did the HDD to SSD upgrade in my 2010 iMac 27" - Pics inside - RedFlagDeals.com Forums
OWC SSD Upgrade Kits for 27-Inch iMac 2010
Apple A1311 iMac 21.5" Mid-2010 Intel i3 3.06GHz 8GB RAM 240GB SSD OS
Amazon.com: OWC SSD Upgrade Kit for 2010 27-inch iMacs, Mercury Electra 500GB 6G SSD, 18" SATA III 6Gbps Data Cable, SSD Power Cable, Installation Tools and iMac Screen Adhesive Tape Set :