Well, marsupials are only found in Australia, and spare tires only show up under the front windscreen in Australian racing.. .. coincidence?
I haven't looked into why some race cars had to carry a spare tire, but I bet it's all about the race series, and I suspect it's due to calling it the GT race car, and what Grand Touring car would be without a spare tire?
https://primotipo.com/page/31/
