This is a A-AH92689 Sprocket, Walker & Shoe Drive PN: AH92689Main Description As Following : A-AH92689 Sprocket, Walker & Shoe Drive P.N: AH92689 Dim A (1): 15 & 15 teeth, 60 chainDim B (2): 3.979"dia.Dim C (3): 19 ID spline Crossed From: AMAH92689 , , AV103845 VAPORMATIC , WN-AH92689 , , WNAH92689 , Found in Section & Models : Separator Area > Separator Sprockets and Sheaves, John Deere COMBINE: 7720 (SN <-610500), John Deere COMBINE: 7721 (SN <610600), John Deere COMBINE: 8820 (SN <-610700) 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 & 15 teeth, 60 chain Dim B (2): 3.979"dia. Dim C (3): 19 ID spline