Ok, sorry to bring up this zombie thread, but I'm getting super frustrated tracking down an ongoing leak dripping through the rear driver's side headliner in the corner on my Gen 1. After looking through these threads awhile ago I concluded that it was most likely the 3rd brake light causing trouble. I noticed that the position/ lean of the truck while parked seems to make a difference in how much water that I get in the cab. Makes sense if there is an easier path to the cab if its leaning one side or the other. I have never seen any water on the passenger side rear headliner no matter how I'm parked. So put some thin weather stripping to bolster the crushed cork like gasket on the brake light itself. All seemed good, but I wasn't checking after every hard rain after awhile. Well sure enough I look back there later and see water on top if the rear bench. Ok, phase 2 bought a replacement brake light and installed and seems like all is well again. Checked after the next rain, forget about it afterwards. Sure enough shit is leaking again. This time I got some thick ass weather stripping and ran a that backing all the way around the exterior of the cab under the the brake light. Weather stripping is right up to the edge all the way around the back of the light. Again, seemed to do the trick. And damned if the thing is not still leaking. I'm starting to wonder if there may be a problem with seal of the window itself. Anyone have any advice?