rocker panel molding clip part #6002840

I am working on a 1970 Plymouth Duster, and need the plastic clips that attach the rocker panel molding/trim to the rocker panel. The part number molded into the clip is 6002840. These clips go into holes in the rockers. They are not the later style that slide onto a pin, which are available from most of the restoration suppliers. I will attach 2 pictures. The first one is the front side. The second picture shows the back side, and there should be small plastic fingers around the plastic pin in the center, but they are broken off. Dimensions are about 1.75"x1". Does anyone know where I could get some of these clips. This would be a good part for one of the restoration suppliers to start making.

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