Do 21.5'' iMacs from other years use the same glass panel than the A1418 of late-2012 ?
Not only the screen diagonal 21.5'' must be same, but also the height, width, thickness, and width of the black frame.
It would be to replace a broken panel, whilst the LCD is undamaged.
Best Answer
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.