Sliding door window question for the experts

[21-window]

I recently acquired a 66 standard sliding door bus that has a popout window on the forward window and a stationary window on the back of the door. The popout window is hinged at the back and the latch is at the front. I was wondering if this is correct? Also it has 3 popouts on the left side and only the front one on the right side.
I have a sliding door 21 window that is unmolested and it is hinged at the front and pops open at the back.
Maybe they came different on the deluxes?

[orangebug60guy]

I have a 66 slider and the front window opens forward and it was coded for 6 pop outs with the second two opening towards the back.
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[21-window]

[BarryL]

Slider popout mechanisms are unique to sliders: the rear one is anyway.