This HS4 SU Carb (1 1/2") mounts to any HS4 intake manifold as used on the Mini & Mini Cooper and for jetting uses the 90 thousands fixed style SU needle. This SU carb provides easy adjustment of the carb mixture, and even utilizes the SU 'Lifting pin' for fine tuning. It also utilizes the 1980 and later style 'Wax Stat' jet tube. The SU carb comes with all new seals, gaskets, needle and seat, wax stat jet tube assembly and new throttle shaft bushings if needed. All parts are inspected, cleaned and polished. This may come with the upgraded jet tube assembly as used on the earlier SU mini.see FZX3003/REB. The air filter to carb elbow will not be inncluded unless you specify in the comment field you need one.