Removing the display requires cutting through the adhesive around the perimeter of the screen. After the adhesive is cut, it cannot be used to re-seal the display in place, so you'll need to apply a new set of adhesive strips.
Part number:946-4468, 946-4469, 946-4470, 946-4471, 946-4472 etc
Fit machine:- iMac13,1 Late 2012: MD093LL/A (2.7 GHz Core i5) - iMac13,1 Late 2012: MD094LL/A (2.9 GHz Core i5) - iMac13,1 Late 2012: MD094LL/A (3.1 GHz Core i7) - iMac13,1 Early 2013: ME699LL/A (3.3 GHz Core i3) - iMac14,3 Late 2013: ME086LL/A (2.7 GHz Core i5) - iMac14,3 Late 2013: ME087LL/A (2.9 GHz Core i5) - iMac14,3 Late 2013: ME087LL/A (3.1 GHz Core i7)
Fit machine2:- iMac14,4 Mid 2014: MF883LL/A (1.4 GHz Core i5) - iMac16,1 Late 2015: MK142LL/A (1.6 GHz Core i5) - iMac16,2 Late 2015: MK442LL/A (2.8 GHz Core i5) - iMac16,2 Retina 4K Late 2015: MK542LL/A (3.1 GHz Core i5) - iMac16,2 Retina 4K Late 2015: MK542LL/A (3.3 GHz Core i7)
It need very professional tools and techinque to install it, so please check you can do it well or not to try.