Good luck you might try a glass store instead of a dealership. I have the same problem with on of my back side windows. The vent/movable bottom part is broken but it appears that I will have to buy the whole frame and the unbroken fixed paneL just to get the small broken piece. I have noticed that on our shower doors latch that it can look like the latch is in place but if you press down harder you can feel it move down a little further and it then seems to be securely locked. Until I figured that out I would have the doors move while driving, now it stays latched.
Tom Marty
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