I recently received a tractor. It says B on the side of the tractor. But it has the A offset. Someone tried to tell me it was a BN but it's too narrow for that I think. It also has a narrow front like a B but I think the tractor started its life as an A. It says B on the side but who knows how many tractors are involved in this. The muffler goes under it. I think it has an intake off a combine or swather on it. Also a questionable air cleaner. The tractor runs great as there aren't too many hours on an overhaul. My plan is to put it back together as an A. If it had a data plate all these questions would be answered. Is there any other way to tell age and model besides the data plate?