Throttle body with stud pattern as Weber 32/36 38mm butterflys. These come with "O" rings to seal base and top so can be used for turbo supercharged application, mounting bolts and lever arm and Colvern TPS. Body tapers from 40mm enrty to 38mm butterflys for optimum air flow. Suitable for many 4 / 6 / 8cyl conversions.