There should be about a 1/4" groove running the length of the wood behind the side of the windshield. The weatherstrip that I saw when I first got my Cabriolet (and since can't locate) was a soft rubber tube, 3/8' to 1/2" in diameter, that had a square section running along it lengthwise that fit into the groove mentioned above. I have seen simialar pieces in catalogues like STEELE RUBBER but never took the time to research it thoroughly....it's on the list, if you know what I mean.