What's included1 - Embedded DisplayPort (eDP) Cable (formerly LVDS cable) This eDP cable for use with 4K Retina screens uses a cable with a 40-pin connection on the logic board and a 60-pin connection on the LCD panel. The non-Retina eDP cable has a 40-pin connection on the logic board but only a 30-pin connection on the LCD panel.
Identifying NumbersAPN: 923-00608There are two eDP cables for 21.5" iMac computers released Late 2015 and this cable is only compatible with those that have Retina 4K displays. Compatible with iMac 21.5" Late 2015 A1418 (EMC 2833) - Compatible with iMac16, 2 Retina 4K
Late 2015: MK452LL/A ( 3.1 GHz Core i5)- Compatible with iMac16, 2 Retina 4K
Late 2015: BTO/CTO ( 3.3 GHz Core i7)