The pinion seal is the whole thing indicated by the green. It is a fairly standard seal used on the smaller Dana differentials, up to the 44 series. Ask for a National 5778 or equivalent.
The roughly welded cone you are talking about is likely the dirt deflector. It's purpose is to prevent sand and dirt from being attracted to the moist seal surface, which would cause rapid wear. They were welded a stamped steel deflector to a cast yoke.....it wasn't always pretty. Sometimes they were simply pressed on, and could work loose. You would then hear a ringing sound when you stop as the slinger would continue to spin on the yoke.
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