This is a A-ACSPROCKET158 Sprocket w/ 1 5/8" Hole PN: ACSPROCKET158Main Description As Following : A-ACSPROCKET158 Sprocket w/ 1 5/8" Hole P.N: ACSPROCKET158 Dim A (1): 3.000" diaDim B (2): 12 tooth Crossed From: AV103220 VAPORMATIC , SW03603 , Found in Section & Models : Headers/Platforms/Feeder House > Corn Head Parts, Gleaner HEAD, CORN: SEVERAL Associated Items : New Also This is An Aftermarket Product And : Dim A (1): 3.000" dia Dim B (2): 12 tooth