If I knew that I wouldn't be selling Buick parts for a living. I would have my own psychic hot line.
No one that I know sells an aftermarket astro roof seal yet. The problem being Buick & Olds had the most Moon roofs out of the Gbodies. That is even limited though.
There has to be a large demand for them. Took me 2 years to re-cover when we built the moon roof headliners. I couldn't just build 30 or 40 of them. Same thing goes with seals.