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Use reduced-dimension nutplates, and nutplate pop=rivets in place of AN
rivets.

You mark the holes though the lite-fixture, then drill for the nutplates.
Then with an appropriate tool, remove any foam or whatever where the
nutplates will go.

Slide the nutplates back behind the fiberglass, then pop=rivet them in
place with the nutplate pop=rivets available from Skybolt Aeromotive.