This is a A-71354897 Coupler Sprocket, Drive PN: 71354897Main Description As Following : A-71354897 Coupler Sprocket, Drive P.N: 71354897 Dim A (1): 1.375" IDDim B (2): 21 splineDim C (3): Teeth: 12 Replaces: 71354897V MASSEY FERGUSON , Crossed From: AV102399 VAPORMATIC Found in Section & Models : Headers/Platforms/Feeder House > Corn Head Parts, Allis-Chalmers (UNDEFINED): SEVERAL, Gleaner HEAD, CORN: SEVERAL Associated Items : New Also A-AC-P-FUELINJ And : Inside Diameter: 1.375" Spline: 21 Teeth: 12