Wow, I have one of those on my duster, I thought it was off of a super coupe or aspen, cool, I was going to through it in the junk! Like you said mine has notches for the rivets, learn something new everyday. Good luck with the sale!
Usually the notches mean that they are original ones. But the easiest way to tell is the original Direct Connection ones are made of abs plastic, while the newer ones are made of fiberglass.