We all know about the company known as Studio Picture Vehicles, and similar companies. Well, I just found out about a group that does the same thing part time, but sticks exclusively with old buses, especially GM "New Look" buses;

http://www.antiquecoachexcursions.com/

Aside from use in movies and TV shows, they also provide tours.

Should add it to this thread:
https://imcdb.kelcommunity.be/forum_topic-8089-71111-Rent_a_movie_Car.html#p71111

Yeah, I was looking for that thread, but I couldn't find it.