This is a A-373666R1 Shaft, PTO Drive PN: 373666R1Main Description As Following : A-373666R1 Shaft, PTO Drive P.N: 373666R1 Spline: 16 , 1.680" Dia.Teeth: 24 Replaces: 373666R1-R IH Found in Section & Models : PTO Parts > PTO and Related Parts, Case-IH TRACTOR: 330 (CLUTCH TYPE), Case-IH TRACTOR: 330 (540 RPM W/ Clutch Type Independent PTO), Case-IH TRACTOR: 340 (CLUTCH TYPE), Case-IH TRACTOR: 340 (540 RPM W/ Clutch Type Independent PTO), Case-IH TRACTOR: 460 (CLUTCH TYPE), Case-IH TRACTOR: 460 (540 RPM W/ Clutch Type Independent PTO) Associated Items : New Also This is An Aftermarket Product And : Spline: 16 , 1.680" Dia. Teeth: 24