This is a A-AH101339 Sprocket, RH Gathering Chain Drive PN: AH101339Main Description As Following : A-AH101339 Sprocket, RH Gathering Chain Drive P.N: AH101339 Dim A (1): Teeth: 11Dim B (2): Bore Size: 1.187" SplinedDim C (3): Hub Length: 1.720" Crossed From: AMAH101339 , , AV103239 VAPORMATIC , BH201339 SHOUP Found in Section & Models : Headers/Platforms/Feeder House > Corn Head Parts, John Deere HEAD, CORN: 1253A, John Deere HEAD, CORN: 853A, John Deere HEAD, CORN: 854A, John Deere HEAD, CUTTING PLATFORM: 453A, John Deere HEAD, CUTTING PLATFORM: 454A, John Deere HEAD, CUTTING PLATFORM: 653A, John Deere HEAD, CUTTING PLATFORM: 654A, John Deere HEAD, CUTTING PLATFORM: 655A Associated Items : New Also This is An Aftermarket Product And : Bore: 1.187" Splined Hub: 1.720" Length Teeth: 11