1972 SCAMP rocker panel clips
I've been looking for them too. The only place I could find was:
http://www.jimsautoparts.com/molding_clips.htm
They want $160 for complete set. I called to see if they would sell them individually, and they said no. That is about $9 a clip! I only need a few so decided to keep looking. Perhaps a group of us who only need a few could split a set.
The fact that somebody sells them suggests they are being reproduced, but I can't figure out who.