, well no wonder. Your window catches are 58 years old.
You've probably got the metallic window catches. Honestly I don't know how to fix them but it's obvious your catches are fairly worn if they all crack open a little bit. I had a bus that did that, had being the operative word there.
I think you should take a window out and disassemble it carefully so you can get access to the window latches. Remove at least one so you have it to compare to donor vehicles, or if you want to purchase some new window catches from a bus window parts place.
With a 58, not to many people here are going to be able to advise you. This is the learning process and it involves just a little pain, and time. Lots of time.