Form a piece of stiff wire (clothes hanger) into the shape you need, line it up along the top centerline of the radiator inlet and manifold inlet, mark the ends of the outlets, and take it to an auto parts store and look over their selection of molded hoses, you'll probably find something that will work. Or fabricate a metal tube and use short lengths of hose to connect each end. Without pics that's the best I can do!
Brian