I don’t believe those are the true GNX’s. There is no numbers on the dash. I think there was a little over 500 GNX’S made. All numbered on the dash. So these are just Grand Nationals.
547 GNX’s made.
http://www.gnxregistry.org/About-the-GNX/Interior-Mods
I don’t remember seeing a ref to them being GNXs. Now THAT would have been a find. To some anyway.