6BT5.9 Cummins Exhaust Manifold 3976789 Parts Catalog Ref No. Part Name Part No. Required 1 Hexagon Flange Head Cap Screw 3944593 12 2 Mounting Spacer 3945252 12 3 Exhaust Manifold 3976789 1 4 Exhaust Manifold Gasket 5266422 6 Above is the introduction of the 3976789 Cummins Exhaust Manifold, while if you need Exhaust Manifold 3976789, complete Cummins engine or …