When adjusting the windows and vent assemblies, keep in mind that they have to align with the roof and windshield. Our car is getting the entire treatment, so we do not have the roof bows or chrome around the windshield. We could get a close approximation, though. The key is to keep things even. Any varying gaps where the vent meets the windshield will be a problem for sure, and the window glass should slide all the way up level. There is some room for adjustment but if its too far out, you wont only have water leaks, but wind noise as well. Either problem could render your pride and joy less fun to drive, and thats why you have it, right? To drive it?