Cummins ISM, L10, M11, QSM Exhaust Manifold, Front, Rear, 4003994

Front and Rear Exhaust Manifold 2.50in Outer Diameter x 1.68in Inner Diameter Cummins L10, M11, ISM Application
This end section will fit both both, high mount and low mount center sections. 
Cross Reference with Part Numbers 4003994, 3067406