Hello. My first post. We replaced the vert window on our '99 328i E36 last week. When the job was done we had that gasket that tucks under the flap left over - oops! So how bad is it? Was it for road noise? Or moisture? Or both? I don't mind the road noise but I don't a water leak. And can I squeeze it back in without re-zippering? Seems like I should be able to raise the flap, insert the gasket, and re-contact cement it in place.