This is not a Camaro question, but I have a 1969 Nova (2-Door) that the rear passenger quarter window falls out of the track when I roll it down. Then when I go to roll it back up I have to realign it in the tracks for it to go back up. Would you say it is the regulator, the window, or roller? How hard is it to replace any of them, The drivers side rear is starting to do it as well, just not near as bad. I figured while I had it all tore apart I would replace whatever it is on both sides. Thanks for any help.