This is a A-H137580 Sheave, Half, Cylinder Outer, Extended Range PN: H137580Main Description As Following : A-H137580 Sheave, Half; Cylinder Outer, Extended Range P.N: H137580 Outside Diameter: 17.710" Crossed From: AV104339 VAPORMATIC Found in Section & Models : Threshing Area > Threshing: Sprockets, Sheaves, Hubs, John Deere COMBINE: 9400, John Deere COMBINE: 9410, John Deere COMBINE: 9450, John Deere COMBINE: 9550, John Deere COMBINE: 9550SH, John Deere COMBINE: 9650CTS Associated Items : New Also This is An Aftermarket Product And : Outside Diameter: 17.710"