Check the Downloads/workshop page. There's something on there from Rosco in NZ, not sure if it is on the water pump page. There are two different water pumps and Milner asked for a measurement of the fan bolts when I priced up a water pump for mine. Like I say check out the workshop and see what it mentions.
Hi there, it appears to be a common fault with the Mistrals fans. Mine had done the same and had to replace it. I have a feeling it's the same as the Patrol but not sure. Best to take off the old one to get a match with the bolt holes and the blades.
You'll have to take off the belts and radiator cowling and hopefully you have enough room to get the bolts out with out taking the radiator out.
If you have to take the radiator read up in the workshop on the water pump.