the various concepts for Disney's Autopia (thanks Steve!) which was sponsored by Richfield

The first production Autopia vehicles in 1955 had fiberglass bodies made by Glasspar.

https://auction.howardlowery.com/Bidding.taf?_function=detail&Auction_uid1=4748512

https://www.undiscoveredclassics.com/forgotten-fiberglass/disneylands-autopia-ride-a-fiberfest-extravaganza-road-track-september-1955/
https://www.lamag.com/citythinkblog/imagineer-that-how-futurist-bob-gurr-shaped-disneylands-past/