Not much showing up aftermarket for that fan unit, whats actually wrong? As others have said if it is just the motor probably get one elsewhere, just need to know the motor details. Not sure where you are, if I can see your old unit or weather you can dismantle and post details
The one that was supplied to @del_boy is,
660 / 950 mm working legnth, so stroke is 290mm.
Piston rod Ø D (mm):45 Cylinder Ø inner E (mm):90
Lifting force (t):11 Tensile force (t):8
CNH type top link also available