This is a A-291578A1 Disc, Transmission Friction External PN: 291578A1Main Description As Following : A-291578A1 Disc, Transmission Friction External P.N: 291578A1 Inside Diameter: 3.910"Outside Diameter: 5.467"Teeth: 54Thickness: .070" Crossed From: 1112-0016 , , 11120016 , , 1712-4429 , , 85808338 CASE-IH Found in Section & Models : Transmission & Rear Axle > Trans Related Parts, Case-IH INDUSTRIAL/CONSTRUCTION: 580SL II, Case-IH INDUSTRIAL/CONSTRUCTION: 580SM, Case-IH INDUSTRIAL/CONSTRUCTION: 580SM PLUS II, Case-IH INDUSTRIAL/CONSTRUCTION: 590SL II, Case-IH INDUSTRIAL/CONSTRUCTION: 590SM, Case-IH INDUSTRIAL/CONSTRUCTION: 590SM II Associated Items : New Also This is An Aftermarket Product And : Inside Diameter: 3.910" Outside Diameter: 5.467" Teeth: 54 Thickness: .070"