Symmetry? And yes, I know it’s symmetrical without the bolt too, people with arsses who are smart. 😉 My homemade bumper bracket has a hole for it!
I’m also guessing tooling line up as well like Bartamos. This is not quite the same as the slots, but I once read a thread about the two little holes on the top underside of the door opening on an AD cab. Someone dug out an old factory photo showing a special jig that slipped into this two holes which allowed the cab to be lifted quite level. I’ve never tried them, but it made sense once you saw them in use.
