Strongly recommend you take your own measurements and use one of the many calculators available on the internet such as Spocalc or Wheelpro, or use the DT Swiss calculator which has a lot of hub & rim measures built in.
If you are building conventional 3 cross pattern then nominal spoke lengths using measures I have are:
Front: 296.5mm
Rear NDS: 295.5mm
Rear DS:293.9mm
So, IF YOU TRUST THE ABOVE, and I make no guarantees, in practice you'll want 48 x 296 and 16 x 294.
I've got some spare Silver 294 mm DT Swiss Competition (Stainless Double Butted) if you are interested PM me.