Martin in the above thread provides butyl installation procedures but GM did not use butyl tape to install windshields. No reputable shop will, they use urethane. Liablity insurance does not allow the glass shop that does all my glass work to use butyl. A lot of hobbiests use it because they can't lay a bead of urethane and it's the easy way out. Some unethical glass shops will use butyl, and many think it was original, which is wrong. If I have time I'll take photos of the clip locations. Once the end clips are installed in the molding, their location at the bottom of the A-pillar is self explanatory. If the hole is still there it's easier yet. There are a few threads at T.C. with pictures if you feel like hunting.
