They are shaped strips of fiberglass 2 or 3 inches wide used as backing for fiberglass body panels that butt up against one another. The panels are glued to the bonding strip and to each other to strengthen the butt joint.
Go to this website and then choose "fiberglass" and "1963" from the search category pull-downs, click "search" and then click on one of the illustrations at the bottom right of that page to see some typical "bond strips"...
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