How to find Twilight Express fares

I know the fare for couchettes or private rooms, where do I find the base fare and seat fares for the Twilight Express, Sapporo to Osaka. Or is the couchette and private room the whole fare?

In the printed timetable or by calling JR or by asking in this forum:

Base fare Osaka to Sapporo on the Twilight Express: 16,170 Yen
Limited express fee: 3,150 Yen (+/- 200 Yen depending on season)

There are no seats on board of the Twilight Express!

Cost for berths:
Single Twin (for one person): 9,170 Yen
Royal (for one person): 17,180 Yen
Twin (for two persons): 8,160 Yen/person
Suite (for two person): 25,490 Yen/person
Couchette (4 persons/compartment): 6,300 Yen/person

So with a japan rail pass, how much will i end up paying in total if i took the 4 person compartment?
Berth-?
Additional cost-?
Total expensus?

For the sleeper trains, the Japan Rail pass covers the basic fare only. You will need to pay both the limited express surcharge and the berth charge.

On this fare table, that means that you would need to pay for items "B" and "C":
http://japanrail.com/pdf/timetable_fare/timetable_fare52.pdf