Anyone got a photo showing he air preheat stovepipe fitting on the engine tin of a 71 bus? I have the correct lower pulley tin with the air preheat hole in it, I have the stock oil bath filter, but I only have exploded parts diagrams showing the parts . . .not much indication on how the stovepipe mounts. And, unless I am mistaken, there is more than one type of stovepipe, so knowing what kind to look for (and knowing what to look for on the engine's underside to confirm what kind is meant to fit) would be very helpful.