do you need one that is an exact fit
There isn't a tank made for an exact fit in a school bus. Use your imagination. Take some time and read this forum. There have been a number of posts about how they mounted tanks, with pictures. There's more than one way to skin a cat. Somewhere in my build post is pictures of both my fresh tanks, which are tucked up inside the frame rails, and my black/gray tanks which are in one of the basement compartments.