Has anyone ever seen one of these? I saw them when I was cruising the internet, there was an explanation how to use them, although it does seem a waste of time.

Below is the explanation:
You need to take both pieces to combine them together. One is for the left headlight and the other is for the right headlight. Once you combine them, on the headlight adjust kit there are three openings that are fitted on the dimples of your head lights. The suction cup is placed on the headlight and you lift the lever to make it suck onto the headlight.
This will create a cross effect with your headlights on. Move a few metres back from a wall, and you should be able to line up the cut offline of the headlights evenly. Since these cars were developed with the projector lenses these were the tools that they were used to lineup the headlights.