Rubber Conductive original to GCW Zero it works.
you just have to cut some legs of the buttons so that the buttons do not collide. Previously, sanding all that part and make it wider holes. It is no easy task. You can make a good mess.
The buttons are very close together, but they are more comfortables and pleasant tightening.
I have no photos of the interior, but the holes for the buttons would be something similar.