Here are pics of the OEM mud guards I bought years ago when the car was being painted. They came from W&N with rubber gaskets. The shop painted them with the black stone guard spray that was also painted in the wheel wells,so the gaskets would not fit against the body of the fender. I used SEM sealer in a caulking tube to seal up all of the gaps around them. They fit perfectly once I bent the pointed bottoms to align the 2 holes for the screws. I don't think any water gets through them into the rockers. The pics show the guards installed for at least 2 years.