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Maybe I can clarify a little. The first page is from the 1955 25 HP parts catalog. Notice that there are two seals 303804 (part no.2). These are inserted into the body of the upper and lower crankshaft bearings. One in each bearing.
Also attached is the parts catalog for 1956 30 HP. Pages 16 and 17 show a single 303804 seal that is inserted into the top crankshaft bearing. A second 303804 is not shown as he bottom crankshaft seal is replaced by the carbon seal.
Anyhow the point is that where two seals are used one gos with the upper crankshaft bearing and one goes with the lower. Otherwise one seal goes with the upper bearing and the lower seal is the carbon seal. That seal has a big spring.
Hope this helps.