Mount for solvent wash bottles

We always have several solvent (EtOH, Acetone, Water, etc.) wash bottles in the fume cupboard. A fixture for hanging them on the metal-rails in the back would remove them from the precocious tabletop area. Thus a minimalism and easy to print holder is given.

For one mount you will need:
One front part (Note: I print the front part lying on it side.)
One back part
Four M3, 20mm hex bolts (I recommend A4 quality to reduce potential corrosion)
Four M3 nyloc nuts

Mount the holder so the surface of the front part is vertical - then the mount grips the wash bottles so nice...