CR-10 dual Z axis upgrade kit For Creality CR-10/ENDER3 3D Printer single motor dual Z axis pulley upgrade
 
Differences between CR-10 and ENDER version:
CR-10 with longer lead screws
CR-10 with bigger closed timimg belt
CR-10 only 1 pcs Z rod cover
CR-10 version:

ENDER3 version: