Just bought a 2009 is250 with 85k miles. The cabin back seats are filling with exhaust when a window or sunroof/moonroof is opened. I taped over the pressure vent as a temporary fix and it works good. Is the replacement part (62930-12161) made of the same rubber/plastic? I think Lexus had one of their interns choose the plastic for the pressure vent. I'd like to think of a better material that will last more than 5 years.