What Edward said is 100% right, although basing upon the year (I understand - the production year) I can be nearly 100% sure that the truck is 352-03, the engine is Perkins and water pump has the number U5MW0167 which is the Perkins No, so you should be able to get it anywhere.
Original Perkins water pump it's a cost of ~ 130Euro, replacement ~60-80 Euro.
This is ONLY to be used to report flooding, spam, advertising and problematic (harassing, abusive or crude) posts.