the car painted to resemble a shoe, for a give away contest, to advertise a show company that was a subsidiary of BF Goodrich

B.F.Goodrich wasn’t the only tire company making rubber soled shoes, Firestone, Uniroyal, Dunlop, and Goodyear all have been in the shoe business

https://www.corvetteforum.com/articles/jack-purcell-racearound-stingray-tennis-shoes/
https://www.defynewyork.com/2014/10/17/b-f-goodrich-jack-purcell-racearound-indy-500-sneakers-1972/
http://oldposter.sneakerlab.net/bfgoodrich/bfgoodrich-jack-purcell-gess-what-inspired-these-new-shoes-2014335.html