Glass panel compability for iMac 21.5'' late-2012 (A1418 - EMC 2544)
After several readings on the web, it seems that the late-2012 and 2013 model share the same panel. Mine was a LM215WF3 (SD)(D1) from LG.

The 2011 model uses another display. 

The 2012/2013 model use kind of monolithic display where you cannot replace only the glass independantly from the LCD.