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I recently replaced my PS fluid after an engine rebuild and it took about 1.5 of the containers that nissan sells at the parts counter. I don't know what size they are but they are certainly not quarts (they're maybe 1/3 to 1/2 a quart). In any case, buy two of those Nissan containers and you should be good.
Note: the Nismo cooler may require a little more fluid than the stock cooler (or no cooler at all)
So get at least 2 qts...if not 3 qts to do the flushing procedure.
I've installed 4 so far, you don't need more than 1. BTW the Nismo one is a joke, you can get the same thing for $30 thru summit or jegs and neither is really good enough for heavy track use.