This is a A-3917780 Gasket, Front Cover PN: 3917780Main Description As Following : A-3917780 Gasket; Front Cover P.N: 3917780 A-3917780 Gasket; Front Cover P.N: 3917780 Replaces: C3917780 MAXIFORCE Found in Section & Models : Engine Parts > 6-830T Turbo Charged Cummins "C" Series, Case-IH COMBINE: 1660, Case-IH COMBINE: 1666 (Engine SN 44706126>), Case-IH COMBINE: 1670 (Engine SN <44706125), Case-IH COMBINE: 1680 (Engine SN <44706125), Case-IH COMBINE: 2166 (SN