I contacted my original dealer a few years ago. I explained I was restoring a car they sold, included a few pics and hoped that they may have a few stickers, brochures, plate frame, keyring, whatever, and happy to pay shipping.
What I got was a blunt 3 or 4 word reply without the need for social skills. I think it was...."nothing like that". No hi, bye, that's cool, good luck with car.
Ok, no worries. I wonder the response if I'd enquired about a car they were selling. As usual, a Californian dealer as was the common area to source cars to send to Aus, new or used. I believe my 78 was in the US until about 1980.