Well, now, you've sent me back to the books (or the Case?IH online books as it were). I missed the reducer on my first pass through there. It's listed as separate part from the elbow and it's not clear from the drawings where it goes, so now I'm gonna shoot from the hip a little.
I can imagine a couple of layouts, which will depend on what the female thread at the top of the manifold is, and what you need to be clamping the pipe to at the top of the elbow.
If it's a 1" pipe thread at the top of the manifold, I can imagine a reducer with a 1" male to come out of the manifold that steps up to mate with the 1-1/4" thread of the elbow, with the pipe clamped to the top of the elbow.
The other way is if the thread on the manifold is 1-1/4". That would mean a plain 1-1/4" elbow with the reducer at the top to clamp the pipe to.
A really elegant solution (though it might mess up the geometry of fitting the pipe and having it hang right) would be an elbow threaded 1" at one end and 1-1/4 at the other, but, plumbing being what it is, I don't know that there is such a beast.
I've always said that the puzzlin' and ponderin' time that is a part of wrenchin' in the dark is some of the most satisfyin' time a fella can spend. I'll be interested in hearin' what you can find, but I would start with a good plumbing supply house.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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