My 02 gasket was gone as well and I used household weather stripping to get a seal. It was D shaped and was white I think 3/16 size. No problems after install. Also used a good quality household washable a/c filter that you cut to size as a cabin air filter. Had enough to make 3 so I put a fresh one in as the old one dries after washing. It also had a carbon type layer that cut down on odors supposedly.