So I purchased a brand new sunroof seal (gasket) for my 81 Grand Prix to replace the old one which is split at the rear. I removed the plastic trim piece and the 8 bolts which secure the glass to the sliding mechanism. But when I try to push the glass out it's obvious that I don't have enough room. So the question I have is do I have to lower the headliner to do this. I would rather not if it's not totally necessary as it would take more time than I have at the moment. 😢