Slider glass, one hole vs. two holes for latch? Never seen

[Alex64]

So I have this box of old split windows glass laying around. Sadly I sold my '64 21 window years ago, figure it was time I got rid of the lingering memories and sell the remaining stuff. Open this box that has been sitting around for 15-20 yrs. and pull them out. Wait? What? Why do I have a set of slider windows with only a single hole for the latch? I only remember double holes. The large hole in single if offset from the double, which I also have one of. The single holed ones are also slightly longer. Oddly they both have the same Sekurit logos on them. This single also appears to have a part # written on it. Anyone have any clues?

[EverettB]

Weird... Barndoor Bus front sliders have a single hole like that but they do not have double Sekurit logos.

Possibly later replacement glass though?

I have never tried to line up a Barndoor and a later slider to see how the holes line up so I cannot comment on that aspect.
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