Federico,
Thank you for the translations on the two documents, all the photos, and the added owner information on this car no 273.
A fiberglass hood is mentioned on the parts list, but nothing about a fiberglass nose. Can you ask the owner if the Shelby hood and Mustang nose on the car are original to it? It’s possible that change was made to the ’68 models (similar to the direction taken on the ’69 models).
I’m hoping you have a front view for us to see the “long range headlights” (grille fog lights).
I still believe the silver side stripes, hood and trunk paint were owner added. The parts list notes GT350 stripes, so I’m thinking it should have the typical rocker side stripes applied, especially because both the ’67’s and the ‘69’s had them. Maybe you could ask about them and if any of those side emblems were added too.
Thanks for all your help,
Rich