This is a A-70255802 Shaft, PTO (540/1000 RPM) PN: 70255802Main Description As Following : A-70255802 Shaft, PTO (540/1000 RPM) P.N: 70255802 NOTE: Center mounting ring is 5.750" dia., w/ 4 bolt holes inner & outer.Dim A (1): 7.875" Long Replaces: 255802 ALLIS CHALMERS , Crossed From: AM70255802 , , HD70255802 , , 108800 , Found in Section & Models : PTO Parts > PTO and Related Parts, Allis-Chalmers TRACTOR: 160, Allis-Chalmers TRACTOR: 170, Allis-Chalmers TRACTOR: 175, Allis-Chalmers TRACTOR: 180, Allis-Chalmers TRACTOR: 185 (SN <12800), Allis-Chalmers TRACTOR: 190, Allis-Chalmers TRACTOR: 190XT, Allis-Chalmers TRACTOR: 200 Associated Items : New Also A-AC-O-160, A-AC-P-160, A-AC-S-1606040, A-FRM-ACCACO, A-SMAC201, A-AC-O-170, A-AC-P-170175, A-AC-S-170175, A-FRM-ACCACO, A-SMAC201, A-AC-O-175GD, A-AC-P-170175, A-AC-S-170175, A-FRM-ACCACO, A-SMAC201, A-AC-O-180, A-AC-P-180, A-AC-P-180185, A-AC-S-ENGG2500, A-AC-S-180 And : NOTE: Center mounting ring is 5.750" dia., w/ 4 bolt holes inner & outer. Dim A (1): 7.875" Long