While driving at approx. 60 mph or more, some vehicles may exhibit a chirp noise from rear right end of the vehicle. The chirp noise may be caused by the right side rear bumper stay hook (A) contacting the bumper reinforce-ment (B) at high speed. The shape of the reinforcement hole has been changed on both sides to eliminate the noise. Also, pads have been added to the bumper stay to prevent contact noise.