A cast cylinder head 1 of an internal combustion engine to be mounted on a vehicle has an intake-side side wall 2i, an exhaust-side side wall 2e, and opposite end walls 3r and 3f. The amplified signal is fed to a sender transducer to generate ultrasonic waves that can be focused and sent to a receiver. The pedicle screw head extenders can either be threaded to or snapped into place within the various pedicle screws.