The caller who has an “ocean” in the back seat of her Mustang. We had an experience a similar problem with a Chrysler Sebring with what thought an ocean was coming out the back seat whenever we stopped. The car dealer also recommended replacing the top. However, a WWW search revealed that there are some drain holes in front of the rear wheels that needed prodding to allow the water to escape. I took a screw driver and pried the holes a little larger to assist in the drainage. Problem fixed.