I replaced the rear quarter trim under the windows but I am still getting a little water in my rear quarters. Looking at the parts diagrams of the rear quarter vents all I see is the duct assembly for about $60 and the louver assembly. I dont see any individual gaskets available. Does anyone know if the rubber gaskets are available by them selves? Also I thin the rear louver is just a hard plastic part and all the weather sealing is the duct. Is that correct?