Rebuilding the fresh air vents

[bigdon-70blazer]

Has anyone rebuilt these? I thought this would be a breeze until I saw these little black rivets and how flat they were and realized that the rivets I have were regular pop rivets and they will leave a nasty looking obstruction on the back. These items are not that great and I can not be the only one that has to replace these seals, so dig deep boys and girls and help me. Where do I find these rivets? I am having the toughest luck with rivets these days!