This is a A-AH115268 Sprocket, Walker & Shoe Drive PN: AH115268Main Description As Following : A-AH115268 Sprocket, Walker & Shoe Drive P.N: AH115268 Dim A (1): 15 & 18 teeth, 60 chainDim B (2): 4.703" & 3.979" ODDim C (3): 19 ID spline Crossed From: AV103284 VAPORMATIC , WN-AH115268 , , WNAH115268 , Found in Section & Models : Separator Area > Separator Sprockets and Sheaves, John Deere COMBINE: 7720 (SN 610501->), John Deere COMBINE: 7721 (SN 610601>), John Deere COMBINE: 8820 (SN 610701->) Associated Items : New Also A-JD-O-OMH111330, A-JD-O-OMH120048, A-JD-O-OMH111330, A-JD-O-OMH120048 And : Dim A (1): 15 & 18 teeth, 60 chain Dim B (2): 4.703" & 3.979" OD Dim C (3): 19 ID spline