This is a A-3903475 Seal, Rectangular Front Crankshaft PN: 3903475Main Description As Following : A-3903475 Seal; Rectangular Front Crankshaft P.N: 3903475 A-3903475 Seal; Rectangular Front Crankshaft P.N: 3903475 Replaces: C3903475 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