I got all my weatherstripping for my T top GN from G Body parts. It's all the aftermarket stuff. The lower door seals are pretty decent, but the T top / upper window seals are complete junk. I knew it wasn't going to be all that great going into it, but I had no other choice since there was nothing else available. That being said I didn't realize that it was going to be completely useless. The thickness and firmness of the parts that seal the windows is not even close to consistent. Everything that is at the last 4 inches of each piece is much softer and leaks bad. The part that seals the T tops to the windows is much thicker and harder than the other parts along the pillars and for the life of me I can't get anything to come even close to sealing after countless hours of tinkering. I had no issues getting my old weatherstripping to seal with my new A-1 window regulators. Each window took my 10 minutes. I had to rip out the old stuff when I had my car painted and ruined it since it was so old. I've spent 20+ hours on these and have finally given up. I'm ready to rip it out and light it all on fire. I'm hoping some day that someone will build a quality set of seals that seals up properly. Until then, I will resort to only driving my car in weather where I can keep the windows down.