NOS Complete Dellorto F20 air filter kit that fits both UB 20/22/24mm carbs and VHB 22/24/26mm carbs. These ONLY fit carbs with 32x1.25 male threads on there carb bodies where the air filters attach. This is a one size fits all application for both UB & VHB carbs. Air filter kit is complete with threaded backing plate, threaded elbow and filter element. . NOTE: THESE FILTERS ARE NOS (New Old Stock) and were made in the 1960's and have shelf wear and imperfections.