A "Deluxe" ute was better known as a "Big Country Ute". It was an option pack like Sandman. More often seen on HX sedans.

There are a few things on it that were not mainstream available options, like seat separator with 4spd, HZ Kingswood grille badge on HJ/HX grille, HQ V8 badges on the front guards, HJ Caprice bonnet badge. If this was a production car none of this would be possible, but if it has a special history like is claimed then anything is possible.