I've tried everything in these forums to stop my trunk leak: new top, 3rd brake light O ring, antenna grommet, etc. Today I heard something I've never heard or read before. My interior shop says the source is likely the butyl gasket, and that it can start to leak over time due to temperature changes, body flex, etc. They found a part that is a gutter you install below the top. It's standard on some newer models, but there's no part number on it and it took the dealer forever to identify the part. It takes him 4 weeks to get it. It's about 150 bucks and takes 3 hours to install. It diverts any leakage to drain holes already in place. It becomes part of the car and stays in place even if you install a new top in the future. Has anyone else every heard of this?