Amazon.com: HumanCentric VESA Mount Adapter for iMac 24 Inch (Aluminum), iMac 27 Inch (2009, 2010, 2011), LED Cinema Display, Thunderbolt Displays, Replaces Apple iMac VESA Adapter MD179ZM/A, iMac VESA Kit : Electronics
Apple Details Thunderbolt Display Connection Options - MacStories
Apple - Thunderbolt cable | www.shi.com
New Apple iMac Overview (May 2011): Thunderbolt, SandyBridge, FaceTime HD comes to the iMac! - YouTube
VESA Adapter for Select iMacs and Apple Displays – HumanCentric
How to add a second screen on your iMac 2011 onwards - YouTube
Amazon.com: Mini DisplayPort to HDMI Adapter for iMac Mid 2011(27-inch, 21.5 inches) Mini DP to HDMI Adapter Compatible with MacBook Air/Pro, Microsoft Surface Pro/Dock, Projector and More 1-Pack : Electronics
Apple iMac review (mid 2011) - The Verge
Apple iMac review (mid 2011) - The Verge
Looking to connect a mid 2011 iMac to an external monitor, these are my connections available. What are my options? : r/applehelp
Sold - 21.5" iMac Mid 2011 // $495 - Boulder Mac Repair
iMac mid 2011: Second monitor through USB, FW800 or Ethernet ? | MacRumors Forums