Sierra International 18-4389 Intake Manifold Gasket Set The Sierra 18-4347-1 Exhaust Manifold Gasket Set is interchangeable with the following: GLM 39870, Mallory 9-61453. Contains: (2) 18-0897 Exhaust Elbow Gasket, (2) 18-2909 Exhaust Manifold Gasket. Each Sierra product meets or exceeds the original equipment part it replaces. Sierra Exhaust Manifold Gasket Contains: (2) 18-0897 Exhaust Elbow Gasket, (2) 18-2909 Exhaust Manifold Gasket Sierra part number: 18-4347-1 Interchangeable with the following: GLM 39870, Mallory 9-61453