I usually use genuine parts, there are plenty of dealers in this country, most are fitted with Jabsco pumps, Bowman heatexchangers, I can supply non genuine gaskets, pistons, rings etc, and a full overhaul kit.
Graham,look in the the back of boats and yachts for sale two brand new 4.108s for sale £5,000 .i want them, but wife,want's new car. tel 0208 853 2321 south london good luck rich.......