This is a A-A153058 Output Shaft, PTO Drop Box PN: A153058Main Description As Following : A-A153058 Output Shaft, PTO Drop Box P.N: A153058 Long: 10.12"Spline: 38 & 21 Found in Section & Models : PTO Parts > PTO and Related Parts, Case-IH TRACTOR: 4490, Case-IH TRACTOR: 4690 Associated Items : New Also A-CA-O-4490DSL, A-CA-P-4490, A-CA-S-44904690, A-CA-P-4690, A-CA-S-44904690 And : Long: 10.12" Spline: 38 & 21