Bucked rivets are my guess!
They are most likely bucked rivets placed before the skins were attached to the door frame. You could pull the inside panel(s) off and replace with new bucked rivets or try to peen the existing rivets over to tighten them up. Otherwise, drill them out and replace with Olympic rivets and shave the heads down to look like original rivets. Ed
1967 Safari Twin "Landshark" w/International trim package
1999 GMC Sierra 1500 SLT
FORUMS MEMBER SINCE 12/16/2004
"My tire was thumping, I thought it was flat!
When I looked at the tire... I noticed your CAT!"