You should place a wanted ad under "Classified Ads" that's under Marketplace in the upper left of your monitor's screen. Someone out there may have a parts tractor, Hal
 
from my parts book on the o-4, the w-4 and o-4 took the same manifold. the orchard series has the underslung exhaust, and used an exhaust adapter flange, p/n 9117d and a special curved exhaust pipe. p/n 57992d for the high compression gasoline engine. for the distillate motor, p/n 54569d was used. the 4 series and the farmall h shared the same engine, so many parts are interchangeable. this site sells the exhaust manifold and gaskets for the h, you would need to use your old exhaust pipe, or have a muffler shop bend up the pipe for you.
 

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