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They are aluminum rivets. There are pneumatic rivet guns and bucking bars to set them. At least that's the way we do it on Aircraft. Not sure how GM did it back in the day. Takes some skill to buck it to aerospace specs.
You'll need a flush rivet set. Shown above is a button head rivet set. The "set" is what's inserted into the pneumatic gun.
68 convertible Deck Lid Hinge Nutplate
