You will likely have to just find a seal with the proper shaft diameter and have a collar lathed up to accept the seal and fit into the bore. However, it seems to me that seal was omitted in later production, and the oil allowed to pass by. I have also seen the seal omitted in the rear of the transmission case. Perhaps the two were allowed to share the oil and find their own levels. It would make the sealing of the transmission to the pinion more important though. I went with RTV between the flanges rather than the wrap around leather gasket in that location.
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