Technical identify the correct vent window please

[2ktj]

Hello, I have been reading and searching with no luck... so I'm turning here for help. I have a 1974 500 with 2 different vent windows, and I cannot figure out which is correct. One has a metal latch at the bottom (with accompanying hole through the glass) and a plastic latch in the middle of the rear edge, while the other side has only the plastic latch. I cannot tell which is correct for the car, and google has been no help haha. If you can help or point me in the correct direction, it will be much appreciated! Thanks in advance...