This is a A-610513C1 Bearing Cup, Gearbox PN: 610513C1Main Description As Following : A-610513C1 Bearing Cup, Gearbox P.N: 610513C1 Outside Diameter: 4.000"Radius: .13"Width: .781" Stocked As: A-28920-I Found in Section & Models : Hay Tool Parts > Baler Parts, Case-IH BALER, SQUARE: 8580, Case-IH BALER, SQUARE: 8585, Case-IH BALER, SQUARE: 8590 Associated Items : New Also This is An Aftermarket Product And : Outside Diameter: 4.000" Radius: .13" Width: .781"