How Does One Secure the Sail Panel Cardboard Inserts 64-66 Barracuda?

Fit and glue the cardboard sail panel first. Then fit the metal trim piece, And you'll find that the metal trim piece wont fit as it hits the thick part of the sail panel. Trim away the padded part of the sail panel so the trim piece can fit in snuggly and once the trim piece fits nicely remove it and now you can put the headliner in place. Now put the trim piece back on over the headliner.

Hope this makes sense.