This is a A-181158A1 Disc, Friction, Transmission PN: 181158A1Main Description As Following : A-181158A1 Disc, Friction, Transmission P.N: 181158A1 Outside Diameter: 5.25"Teeth: 45 Found in Section & Models : Transmission & Rear Axle > Clutch Plates: Clutch and PTO, Case-IH INDUSTRIAL/CONSTRUCTION: 570LXT (Qty: 12), Case-IH INDUSTRIAL/CONSTRUCTION: 580L (Qty: 12), Case-IH INDUSTRIAL/CONSTRUCTION: 580L II (Qty: 12), Case-IH INDUSTRIAL/CONSTRUCTION: 580SL (Qty: 12), Case-IH INDUSTRIAL/CONSTRUCTION: 590SL (Qty: 12) Associated Items : New Also This is An Aftermarket Product And : Outside Diameter: 5.25" Teeth: 45