Mark, If you haven’t solved this yet, I replaced my upper window seals with a standard product. I measured the old seals, and the flange size, and matched this to something similar to the Trim-Loc seal. I was able to easily replace the seals on both sides. There is now a seam where the two ends of the seal meet. I put the first one at the bottom, and then when I looked at it, it looked better if the seam was at the top. One of each. That was over a year ago & no leaks. If it’ll help you, I may be able to find the exact material I purchased. Michael/ Tortuga44.