new member need help with a 67 coronet 2dr window set up

[macho781988]

the window comes off the track in the back when i roll the window up and im thinking i have the wron glass or the wrong track how do i tell which one is off?

 

[macho781988]

ok guys nvm i poked around a looked at the other window and discovered i was missing a piece but i found it and now everythings up.