1970 Duster rocker panel molding clip part #6002840

I am working on a 1970 Plymouth Duster.
I need a few of the white plastic clips that attach the rocker panel moldings to the rocker panel.
The part number molded into the clip is 6002840.
This clip goes into holes in the rocker panel.
It is not the same as the 1971 and later style clip that slides over a pin sticking out of the rocker panel.
I don't know exactly how many I will need yet, because we are still trying to remove them, and some of them are breaking during removal.
Thank you