Vibrant Performance Bosch Throttle Body to HD Adapters ensure that you never again have to weld an HD Clamp Ferrule to your Bosch 82mm DBW Throttle Body. Each adapter comes with (1) HD Clamp O-ring, (2) Throttle Body O-rings (-042) and (4) M6 x 1.0 long socket head cap screws. Made from 6061 Aluminum