Sierra 18-0872 Exhaust Manifold Gasket Sierra Exhaust Manifold Gasket Use with: 18-1950-1 Manifold, 18-1951-1 Manifold Sierra part number: 18-0872 Interchangeable with the following: Barr MC47-27-33395, GLM 31100, Mallory 9-61401, Mercury 27-33395, Osco CV-GH