This is a A-518529M1 Shaft, PTO (540 RPM) PN: 518529M1Main Description As Following : A-518529M1 Shaft, PTO (540 RPM) P.N: 518529M1 Dim A (1): 9.147" LongDim B (2): 36 Internal Splines Crossed From: HD518529 , Found in Section & Models : PTO Parts > PTO and Related Parts, Massey Ferguson TRACTOR: 1080, Massey Ferguson TRACTOR: 1085, Massey Ferguson TRACTOR: 285 Associated Items : A-88508-I Also A-FRM-MH, A-MH-O-MF1080, A-MH-P-MF1080, A-MH-S-MF1080, A-SMMF201, A-MH-O-MF1085, A-MH-P-MF1085, A-MH-S-MF1085, A-SMMF201, A-MH-O-MF285, A-MH-O-MF285LATE, A-MH-P-MF285, A-MH-S-MF285 And : Dim A (1): 9.147" Long Dim B (2): 36 Internal Splines