keter click-bin (small size) bottom shelf mount

Mounts for keter click-bin (small size) containers.
I used 4.2mm self-tapping screws to fix them to the shelf.

Distance between edges of the mounts should be around 78-81mm, but i'd suggest to perform additional in-place check with real container.

To print right-side mount just flip left-side one by X axis in your slicer.