This is a A-N104147 Sprocket, Coupler PN: N104147Main Description As Following : A-N104147 Sprocket, Coupler P.N: N104147 Dim A (1): 60 chainDim B (2): 14 teethBore: 1.500"Keyway: .375" Crossed From: AV104804 VAPORMATIC Found in Section & Models : Headers/Platforms/Feeder House > Grain Head Parts, John Deere COMBINE: 105, John Deere COMBINE: 3300, John Deere COMBINE: 4400, John Deere COMBINE: 45, John Deere COMBINE: 55, John Deere COMBINE: 6600, John Deere COMBINE: 7700, John Deere COMBINE: 95 Associated Items : New Also A-JD-S-SM2054, A-JD-S-SM2054, A-JD-S-SM2054, A-JD-S-SM2054 And : Bore: 1.500" Chain Size: 60 Chain Keyway: 0.375" Teeth: 14