I need to work on the fiberglass insulators that are inside of the chrome covers. To do this I'll have to remove the interior metal shield and the related attaching rivets from the fiberglass core. Where can I get replacement rivets. See pix of existing rivets that I have to remove and replace. There are two rivets at the top of the pix. You can also see the attaching holes in the fiberglass that I have to fix. Thanks, Patrick