Need help- Rocker Panel Molding Clips ?

Good morning- I'm hoping someone can help me out. I have a 1970 Duster with the wide aluminum rocker panel moldings that run the length of the car below the door. They use the white hard plastic clips and I have 2 broken ones that will no longer hold the molding in place. I have looked high and low and cannot locate a part number nor a repopped clip to purchase. Can anyone point me in the right direction ? Thanks in advance, Ron