This is a A-199727C1 Sprocket, Driving PN: 199727C1Main Description As Following : A-199727C1 Sprocket, Driving P.N: 199727C1 Dim A (1): 15 ToothDim B (2): 3.294" O.D.Dim C (3): 29mm Hex Hub Crossed From: AM199727C1 , , AV101378 VAPORMATIC , WN-199727C1 , Found in Section & Models : Headers/Platforms/Feeder House > Corn Head Parts, Case-IH HEAD, CORN: 1043, Case-IH HEAD, CORN: 1044, Case-IH HEAD, CORN: 1054, Case-IH HEAD, CORN: 1063, Case-IH HEAD, CORN: 1064, Case-IH HEAD, CORN: 1083, Case-IH HEAD, CORN: 1084, Case-IH HEAD, CORN: 900 SERIES Associated Items : New Also This is An Aftermarket Product And : Dim A (1): 29mm Hex Hub Outside Diameter: 3.294" Teeth: 15