This is a A-AH131979 Pulley, Fan Drive PN: AH131979Main Description As Following : A-AH131979 Pulley, Fan Drive P.N: AH131979 Dim A (1): 289 mm O.D. (490-980 RPM) OPT.Dim B (2): 11.370" O.D.Dim C (3): 1.252" I.D. Crossed From: AV103432 VAPORMATIC , WN-AH131979 , , WNAH131979 , Found in Section & Models : Separator Area > Separator Sprockets and Sheaves, John Deere COMBINE: CTS (SN <670400, 289 MM O.D. (490-980 RPM) OPT.), John Deere COMBINE: 9400 (SN 670101>, 289 MM O.D. (490-980 RPM) OPT.), John Deere COMBINE: 9500 (SN <670200, 289 MM O.D. (490-980 RPM) OPT.), John Deere COMBINE: 9500SH (SN <670200, 289 MM O.D. (490-980 RPM) OPT.), John Deere COMBINE: 9501 (289 MM O.D. (490-980 RPM) OPT.), John Deere COMBINE: 9600 (SN <670300, 289 MM O.D. (490-980 RPM) OPT.) Associated Items : New Also This is An Aftermarket Product And : Inside Diameter: 1.252" Outside Diameter: 11.370" (289 mm). 490-980 RPM OPT.