Not sure if you know, but the rebuild kits are still available.
The Iveco dealers have huge stocks of the impellers and the local one here didn't have any idea what they were for, part number 858333 R1, and they get the rest of the seals, shaft, bearings and gaskets from a mob called Auto Surplus. Their kit is part number WS588.
The impeller cost me $103.82, the rest of the kit cost $130.73 and there was $20 express freight. Might have been tax ex prices, I can't find the original receipt and only have this pic to go from.

Contact info for Auto Surplus is;
35 Rooks Road, Mitcham
Victoria 3132 Australia
Tel +61 3 9873 3566
Fax +61 3 9874 1485
Email sales@autosurplus.com.au
I'm betting Iveco added their own finders fee onto the kit cost. If you don't stuff the impeller getting it off, you can easily save yourself $103.82. It's a very easy job if you have a press. It was the reason I bought my press, and since then I have used it for dozens of things, even straightened a crowbar.
My impeller was actually very good, with just some minor wear or chips off the end of a couple of the fins. Possibly from hitting solidified chunks of that orange anti corrosion gunk they used to put in the cooling systems. I could have easily and happily reused mine, but seeing as how the Iveco guys chased the kit down from an after-market dealer and got it in, I thought they might get upset if I dropped the bit that they actually sold. That, and I didn't know that I could get the old one off so easily.

Of course, if you actually need the water pump housing, the above info won't help you.

Greg.
ps. Now that I have the F1 there's a good chance that I will also find the water pump starts leaking in it, when I get it running again.
