The GM Part number includes two "extensions". This is what you get in the box:
http://www.imagestation.com/mypictures/i...ption=04%20tips [img]http://www.imagestation.com/mypictures/inbox/view.html?id=4229869044&url=http%3A%2F%2Fwww.imagestation.com%2Fpicture%2Fsraid62%2Fp1d59e6e8b1d14cf08b776d0f9266f64d%2Ffc1eadf4.jpg&caption=04%20tips[/img]
The grills should be out soon, the spoiler - who knows....