All of our new parts are aftermarket replacements. Compatible with Allis Chalmers Tractor(s) D15, D19, 190. Compatible with Case Tractor(s) 700, 730, 840. Compatible with International Tractor(s) 656, 666, 686. Compatible with John Deere Tractor(s) 2520, 4030. Compatible with Massey Ferguson Tractor(s) 175, 180. Compatible with Minneapolis Moline Tractor(s) GB, GTB, GVI, M670. Compatible with Oliver Tractor(s) Super 55, Super 66, Super 77, Super 88, Super 99, 66, 77, 88, 99, 550, 660, 900, 1600. Replaces Marvel Schebler Mfg nos TSX394, TSX777, TSX848, TSX268, TSXU839, TSXU995. 2-11/16 Center to Center bolt pattern, check before ordering. Fits Zenith Updraft Carb. 46 mm Inside Diameter Throttle Bore, 41.7 mm Choke Bore, 1/8-27. All States Ag Parts Item No.