Welcome to the new Wizard Outboard Forum.
Try the flying Scott guy. http://home.earthlink.net/~flyingscott/index.html He does good work. You want the "Merc KG" impeller for your WF-4. He will want the old core to make new ones. flyingscott@earthlink.net
hey thanks i think i might have him make me a spare as i did end up making one from the OMC one, just wanted to get this engine going before i pored to much money into it, but so far it runs good just needs a darn tune or a carb cleaning.