How can I fix my Honda-powered Primavera 548s rotary lawnmower?

Everything has gone well until the Bowden cable that engages the drive to the wheels snapped yesterday! Primavera is made by an Italian company Ernesto Marazzini SpA, now owned by Husqvarna. Where can I obtain a replacement cable and how do you fit it: the drive gearing is located in a compartment of the deck of the lawnmower and accessibility looks difficult.
Model 548s Serial no. 145782 Serial 1998