Correct. The one he posted was more like the SS ones which is what I would do if I was to go that route. They make replicas now since you can't find the OEM ones.I think the piece on the truck that Wes posted looks like it is a little more pronounced than the stock one.
I thought I got the wrong tailgate cap on my 2007 when I bought it used until I discovered that they had two different stick tailgate caps. One was simply a round top cap and the other was the airfoil shaped cap. I kept looking for an airfoil style one but ended up trading the truck in before I found one at a price I would pay.