Gents, the ASC roofs installed before delivery are a different situation than "dealer installed". ASC did have a few installation centers, but certainly did not do anywhere near all the "dealer installed" sunroofs. If the car was pre-sold with a sunroof, it would ship (usually from a distribution center, not the assembly plant) to the closest install location and get completed.

There are quite a few independent ASC dealers that did installs, but there were also several competitive brands that had installers around the country, and the dealers could use anyone they want for roofs that were not the factory option. It was not mandatory that the dealer sell an ASC product if they wanted to add a sunroof.