In case it's not clear from the above, there are a zillion configurations.
International started it. Who did the body work (e.g., Bluebird, IC, Thomas)?
Buses come in three common types: engine out front ("Conventional"), flat front with engine next to driver (Front Engine), engine behind ("pusher" or Rear Engine).
Because of this, plus the different options available (all sorts), you get brain freeze trying to research this - which you've experienced. But it also means you have to be very, very specific when asking here. By doing so, however, you can sometimes find someone with nearly or exactly the same bus. Looks like you lucked out with Mr. Coyote - who has a tape measure and stands at the ready. Well, tomorrow, anyway. But you might describe for him in greater detail what you are investigating, if possible, to ensure his numbers will be useful to you.