This is a A-A58388 Trans Disc: 12" PN: A58388Main Description As Following : A-A58388 Trans Disc: 12" P.N: A58388 Spline Count: 19Spline Diameter: 1.250" Replaces: A58388-R CASE , 58388 CASE Found in Section & Models : Clutch Parts > Powershift, Case-IH TRACTOR: 1070 (S/N <8725655), Case-IH TRACTOR: 1090, Case-IH TRACTOR: 770, Case-IH TRACTOR: 870, Case-IH TRACTOR: 970 Associated Items : New Also A-CA-O-1070L, A-CA-P-1070, A-CA-S-970TM, A-CA-S-9701070, A-SMC203, A-CA-S-1090ETC, A-SMC203, A-CA-O-770870, A-CA-P-770AK, A-CA-S-770ETCDB, A-CA-S-770TM, A-CA-S-770870, A-SMC203, A-CA-O-770870, A-CA-P-870, A-CA-S-770870, A-SMC203, A-CA-O-970, A-CA-P-970, A-CA-P-970L And : Spline Count: 19 Spline Diameter: 1.250"