This is a A-AN102027 Sprocket, Row Unit, RH, 30 Tooth / 60 Chain PN: AN102027Main Description As Following : A-AN102027 Sprocket, Row Unit; RH, 30 Tooth / 60 Chain P.N: AN102027 Dim A (1): 30 ToothDim B (2): 7.590" O.D.Dim C (3): 1.130" Hex Hub Crossed From: AV103927 VAPORMATIC Found in Section & Models : Headers/Platforms/Feeder House > Corn Head Parts, John Deere HEAD, CORN: 493 (SN 660201 - XXXXXX), John Deere HEAD, CORN: 494 (SN 660201 - XXXXXX), John Deere HEAD, CORN: 692 (SN <705250), John Deere HEAD, CORN: 693 (SN <705437), John Deere HEAD, CORN: 694 (SN <705420), John Deere HEAD, CORN: 892 (SN <705500), John Deere HEAD, CORN: 893 (SN <705984), John Deere HEAD, CORN: 894 (SN <705667) Associated Items : New Also This is An Aftermarket Product And : Hub: 1.130" Hex Outside Diameter: 7.590" Teeth: 30