Mysterious mounting points

[Aligator]

Hi,

During the renovation in my car, I found a strange screw holes .
I think we were here before seat belts.
but I never saw such belt anchorages.
Maybe someone has seen something similar .

Martin

[w113dude]

I don't have these and never seen it, but by the look of the bracket it is for a seatbelt, are the usual threaded hole on the sides there? it is possible those were rusted-out and these were put in instead.