My '73 4000 is a gasser, and came that way from the factory according to the numbers stamped into the flat spot, which agree with the sticker that's still on the underside of the hood, and mine has the diesel type oil bath air filter, and as far as I can tell, it came that way from the factory as well. There is no cut-out on the side of the hood for the dry filter, and everything about the oil bath filter looks to be the factory diesel type, and looks original to the tractor. I took the filter housing out last year to soak everything, and the places where the brackets mounted to the nosecone of the tractor showed all original paint and original spots with no paint at all under the the bracket mounting points. Mine started life as a state owned highway mower, so they may have special ordered it that way from the factory, but mine is an example of at least one 3 cylinder gasser that came from the factory with the oil bath air filter.
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