Attach your compatible Apple display or iMac to your VESA-compliant mount with the HumanCentric VESA Mount Adapter. It is designed specifically for use with Apple Thunderbolt Display, LED Cinema Display, aluminum 24" iMac, and late 2009, mid 2010, and mid 2011 27" iMacs, allowing your device to be attached to mounts with 100 x 100mm VESA patterns.
Note:
Not all versions of the listed models are compatible; this bracket only works with models with a removable stand. Please see the manufacturer's website for more info.