This is a A-74513381 Pulley, Water Pump (Single Groove) PN: 74513381Main Description As Following : A-74513381 Pulley, Water Pump (Single Groove) P.N: 74513381 New 1 groove water pump pulley fits the Allis-Chalmers Tractor D17 (series III diesel) or D19. Found in Section & Models : Cooling Systems > Water Pumps, Pulleys, & Gaskets, Allis-Chalmers TRACTOR: D17 (Series III Diesel), Allis-Chalmers TRACTOR: D19 Associated Items : New Also A-AC-O-D17DERLY, A-AC-O-D17DSL, A-AC-O-D17GAS, A-AC-O-D17III, A-AC-O-D17IV, A-AC-O-D17MID, A-AC-O-IMPLHITCH, A-AC-O-MARKIVANDV, A-AC-P-D17, A-AC-P-D17SERIV, A-AC-S-D17, A-AC-S-FUELINJ, A-FRM-ACCACO, A-SMAC201, A-AC-O-D19, A-AC-O-IMPLHITCH, A-AC-P-D19, A-AC-S-D19, A-AC-S-FUELINJ, A-FRM-ACCACO And : New 1 groove water pump pulley fits the Allis-Chalmers Tractor D17 (series III diesel) or D19.