I don't know how they got added. However, I am the second owner and have had the vehicle since 1977. The original owner, who was my neighbor passed away about three months ago, so I can't ask him.
What I do know is that whom ever did the work, did so with all ford components, that includes the plastic grommet that was used on the deck lid and the ones that are in the hood are also Ford and ran through the hood structure. If it wasn't done by Ford, someone did some fantastic work.
-Keith