Luggage rack bracket question.

[37 Coupe]

I guess it is not that critical of a question but I just wonder if anyone knows what this notch is for that all the repro luggage rack brackets have? It seems to serve no function .I just look at this and wonder why they even stamp this process or step in making them.Must be something that was on the original ones? Seems it would take quite the press or stamping to punch out that thick of metal for no reason.Inquiring minds want to know,at least mine.