Yet again, when faced with the choice of no GM part, I went with LMC, and was let down. First it was the rear window seal (the u-channel) made incorrectly, now it's the seal that is glued to the topper and runs the length of the bed, sealing the tailgate edge and cab edge as well as the bedsides. First off, it's about 4" too short. That could be normal (?) as it looks like it will stretch quite a bit. Of course the factory one I pulled off is the right length, but that could be from the 20+ years it's been there. Anyway, the best part...each end is retained with one screw. Have the top upside down, screwed the rear part down, then laid it down the bed it is glued to. Stretched it towards the front screw, get it around the bend, and realize the end I'm looking at is the exact opposite of what it is supposed to be. Pull the other seal out, lay it down, yep. If I cut both seals in half, then swapped the halves, I'd have the correct seals. Looked at the two SPARE tops I have that still have the factory gaskets, there is no difference among the 3 stock pieces, LMC's stuff is yet again made incorrectly. Haven't heard of anyone else having this problem, I hope this is an isolated problem that they found and corrected. Now I've got the top off, pieces in the yard, and no gaskets. Get to call back Monday because customer service is already closed. No offense to any Thai folks out there, but quality control in Thailand (all 3 mis-made pieces are bagged "made in Thailand") is apparently a foreign concept. Yet again, if GM makes the piece you want (especially weatherstripping) buy it from them, regardless of cost.