Yes, you'll need a new breather tower, hoses and a reed valve for the airbox.
Be warned, you'll probably pay more for the other items you need than you did for the breather box itself!
Part numbers:
Crankcase breather tower - 257.2.003.1A
Hose (tower to breather box) - 876.1.064.2A
Hose (breather box to airbox) - 876.1.057.1A
Airbox reed valve - 593.1.019.2A
Hope that helps!
Neil.
P.S. STM and Vee-Two (Australia) both do Corse style breather towers that are significantly cheaper than the genuine Corse item.
P.P.S. If you need any other info just drop me a line.
[Edited on 30-3-2005 by neil748r]