ROCKER BOX AND VALVE COVER GASKET SET FOR NHC 250 CUMMINS ENGINES FOUND IN M809, M939, AND M939A1 MODELS. 

3 GASKET SETS REQUIRED PER ENGINE.

NOT FOR M939A2 WITH CUMMINS TURBO ENGINE. 

PART # 3017750 & 3054841 NSN 5330-00-861-8592 & 5330-01-285-4827