Hi just a quick note, i did the pump not too bad a job took about 3 hours, most of it mopping up! If anyone else is thinking of doing one the advise from above is spot on only on mine, the old one has 3 bolts one at top, middle and one right at the bottom.
The top and bottom didnt have a thread and just went through the pump and then screwed directly into engine block, the replacement is exactly the same just needed to drill out the top and bottom holes as they had threads on them, not sure why but if replacing just double check fitting as its a bit of a fiddle to get the swine in/out!