This is a A-3917729 Bolt, Head, Short PN: 3917729Main Description As Following : A-3917729 Bolt, Head; Short P.N: 3917729 Use ONLY On Engines Built Year 1991 & Up.Use ONLY on engines built from year 1991 & upOverall Length: 3.788"Thread Length: 2.430"Useable Length: 3.155" Replaces: C3917729 MAXIFORCE , Crossed From: HCK3917729 , Found in Section & Models : Engine Parts > 6-830T Turbo Charged Cummins "C" Series, Case-IH COMBINE: 1660 (Qty: 12), Case-IH COMBINE: 1666 (Engine SN 44706126>) (Qty: 12), Case-IH COMBINE: 1670 (Engine SN <44706125) (Qty: 12), Case-IH COMBINE: 1680 (Engine SN <44706125) (Qty: 12), Case-IH COMBINE: 2166 (SN