Replaced Pano roof surround seal as well as the seal on the rear pano glass. My only input for a perfect fit of the seal is to make your mark where you think the cut needs to be than add an 1/8" or so. Using some heavy duty very sharp thin bladed scissors, nip off just a tiny bit at a time to make it a perfect tight fit. Using those types of scissors makes cutting the seal easy. I tried a razor blade and cheap dull house scissors and mucked up my first effort at getting a clean straight cut. Figured I'd replace the seals since they were 17+ years old even though they looked fine. Had the glass out to re-do my headliner in Alcantara so "while I was in there" decided to replace it.