Rostamlo also tried to convince us that the vent window rubber shouldn't be messed with since ours was in pretty good shape. We, of course, decided that we should change it since we had new rubber in the kit. Boy, were we wrong. The original vent rubber is a two-piece design, whereas the new rubber is a one-piece design, and in order to install it you need to drill out some rivets, and then either re-rivet it back together, or put in some small bolts. This became a huge headache to the point that we ended up leaving the old vent rubber in the passenger-side door.