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For the top of the crankshaft you use one 303804 seal and it is lightly pressed into the top bearing. For the bottom of the crankshaft you use one additional seal that also is lightly pressed into the lower bearing for a total of two. UNLESS you go to the carbon type lower seal. Carbon type seal replaces the 303804 seal . With a carbon lower seal you will use only one 303804 and that is for the top of the crankshaft.
You will only use a max of two seals per motor, (never 3).
BTW 303804 seal is superseded by 321467. I think the Sierra number is 18-2060 but the package will say if it is same as 321467.