Seatbelt Upgrade

The story goes that Sweden required three-point seatbelts in all cars starting in 1965 or something. Volkswagen's solution, since they didn't want every country to have three-point seatbelts, was to give every bus the threaded holes for the belt's third point, but then only give the better belts themselves to the Swedes. 

In any case, it makes it easier when, 45 years later, you want to install a three-point belt for your too-big-for-a-carseat-too-small-for-a-lapbelt-only 10 year-old.