71 Challenger w/ vinyl roof C-Pillar trims

Does anyone know what sort of clip or fastener holds the stainless trims (bottom of vinyl) to the C-Pillar? There are posts that stick out of the body C pillar but what actually slides inside the stainless mold so that they can clip on to the posts? And what are they called so I can try and find them, or if anyone knows a store that stocks them? I'm in Australia, so they'd be impossible to source down-under. Thanks!
Author: 70Hardtop