Pretty sure that they are not available from anyone yet. I was looking for a set when I painted my Dart and didn't have any luck. I might have one around the garage somewhere but it is off a car that was in the junk yard so it's not in great shape either.
If you have a set and they just look bad from being in the weather you can use a rag and some WD-40 and clean them up a bit. It really puts the black back in them and softens them up a bit.
Let me know if you find them repoped though, I would be interested in a set as well.