These futuristic cars and trucks were in the lower product plaza of the GM Futurama, I think it was called Containerized Freight Exhibit or modern mobility. They are made of plaster, were meant to be destroyed but were taken home by a GM employee for his kids to play with, carefully!

Futuristic car of tomorrow from the Futurama Exhibit at the 64 New York Word's Fair!

Futuristic trophy from G.M. Design given to Ken Kimble in the 80's upon retiring ( he was the glass supplier for all GM autos)