This is a brand new replacement carburetor for tractors. This is used on models: Chalmers: D17, WD45, 170 Massey Harris/Ferguson: MH33G 1953 and up, 333 Gas, 21 Combine Minneapolis Moline: G4, MT, Z, ZA, ZT, 445, Jetstar, 4 Star, Motrac, Unitractor Oliver: Super 77HC, 88HC, Super 88HC 1954 up, 770, 1550 Replaces part numbers: 101604AS 10A11452 10A15430 10A6464 11588 11973 12032 12217 12287 13294 13795 14991 226257 226258 226275 229342 231431 237860 239961 249952 51083B 535574M91 764920M91 766576M91 767191M1 768190M91 768191M91 IKS393 IKS393B IKS393C RE733C TO16383 TO17042 TSX181 TSX221 TSX296 TSX332 TSX360 TSX374 TSX397 TSX413 TSX414 TSX436 TSX464 TSX466 TSX505 TSX506 TSX506A TSX528 TSX561 TSX575 TSX596 TSX633 TSX645 TSX713 TSX725 TSX755 TSX773 TSX792 TSX797 TSX814 TSX825 TSX853 TSX869 TSX871 TSX902 TSX903 TSX97 TSXU835 TSXU836 Z11588 Thanks For Your Business!! 17A14