Use with: 18-1908: Manifold Riser Spacer,18-1952-1: Manifold,18-1957-1: Manifold,18-1970-1: Elbow,18-1985: Manifold Spacer,18-1974-1: Elbow,18-8556: Exhaust Elbow Mounting Kit,18-1953-2: Manifold,18-1958-1: Manifold,18-1962-1: Manifold,18-8554: Exhaust Elbow Mounting Kit,18-1976-2: Manifold Elbow.