This is a A-184454C1 PTO Drive Plate: used w/ J915096 flywheel PN: 184454C1Main Description As Following : A-184454C1 PTO Drive Plate: used w/ J915096 flywheel P.N: 184454C1 PTO Drive plate: used with J915096 flywheel. For Case-IH models: Combine 1680 (S/N JJC0045689>)Diameter: 13.874"Spline Count: 13Spline Diameter: 1.625" Crossed From: AV101210 VAPORMATIC Found in Section & Models : Clutch Parts > PTO Drive Clutch, Case-IH COMBINE: 1680 (S/N JJC0045689>) Associated Items : New Also A-IH-S-1660COMB And : PTO Drive plate: used with J915096 flywheel. For Case-IH models: Combine 1680 (S/N JJC0045689>) Diameter: 13.874" Spline Count: 13 Spline Diameter: 1.625"