The new gantry adapter works with the official creality linear rails kit that comes with a new backplate and 4 bolts.
Creality rail kit for ender 3
You have to use both model for this to work as both have been adapted to work toggether.
The author remixed this model.
This is a remix of the Hero Me 7.4 gantry adapter and universal base fixed to adapt to the creality rail backplate. I've added holes for the new backplate that attach with the 4 3mm nut commingg wiht the official creality kit.
I've had to move the new gantry adapter holes to the original hero me by 6mm on both the universal base and the backplate adapter for this to work.