These are raised feet using yellow dot or double yellow dot squash balls (40mm diameter, might work with other balls). They should work for every printer using the 4040 aluminium extrusion.
The two versions are for either M4 or M5 T-Nuts. The only change are the diameters of the screw holes.
The center of the ball is raised by 45mm from the flat surface, so depending on printer weight / ball firmness etc… you should get around 60mm give or take under the frame with those feet.
The shims are for the Ender 3 v2, where a piece of sheet steel interferes. You shouldn't need those for other machines.
The author hasn't provided the model origin yet.