Sierra's 18-1935-1 Riser is constructed of durable cast iron material. Use with Sierra's 18-1931-1 Manifold, 18-8510 Exhaust Elbow Mounting Kit, and 18-2971-1 Exhaust Manifold Gasket. The riser comes with (1) Sierra 18-2971-1 Exhaust Manifold Gasket, (4) Sierra 18-4236 Washers, and (2) Zinc Bolts (5/16-18 x 5-1/2 Grade). It is interchangeable with Mallory 9-40910, GLM 51510, Barr VO-20-855384, Osco 56879, HGE 5384, and Volvo Penta 855384-4 and 856891. Check manufacturer recommendations to ensure a proper fit before purchasing. Each Sierra product meets or exceeds the original equipment part it replaces. Constructed of durable cast iron material Use with Sierra's 18-1931-1 Manifold, 18-8510 Exhaust Elbow Mounting Kit, and 18-2971-1 Exhaust Manifold Gasket Comes with (1) Sierra 18-2971-1 Exhaust Manifold Gasket, (4) Sierra 18-4236 Washers, and (2) Zinc Bolts (5/16-18 x 5-1/2 Grade) Interchangeable with Mallory 9-40910, GLM 51510, Barr VO-20-855384, Osco 56879, HGE 5384, and Volvo Penta 855384-4 and 856891 Check manufacturer recommendations to ensure a proper fit before purchasing MODEL NO - 1819351