I don’t know how to thank all the information you have brought with you, with so much clarification.
I'll tell you the reason I came to ask about the - let's call now auxiliar wheel carrier, just to be clearer - so as not to look like a crazy person than I should have already appeared kkkk
As I think the text shows, I’m no less knowledgeable enthusiast about automobiles, however I have true fascination for the contemporary cars at the Eldorado Biarritz of 1959. Because of this, I researched for a good few days for a miniature that I liked the most purchase. Because I had an obvious preference for Biarritz and because I had found a 1:12 size model, it was pretty much decided that I would buy this one. However, the size and the model itself didn’t make me forget the "absence" of an auxiliary wheel carrier in that car, a detail that in my opinion adds a unique charm to the car, so I thought I'd add this detail.
BUT as I think it could also be noticed in the text, I never thought about doing something without historical accuracy, it was never in my plans to “add any tire to the back of the car and that's it”. The information that this item was not included in the factory default for this car came quickly to my ears, but even so I thought it could be bought as an option at the dealership at the time, or that at least there was something that could assure the existence of any standard look for the item added precisely to that car. Thanks to your help, I clarified that no, that what I thought has no basis.
Therefore, since my intention was never to do something out of historical accuracy, even if this "charm" guaranteed by the presence of the auxiliary wheel carrier is missing, if a 1959 Eldorado Biarritz shouldn’t contemplate the presence of any similar item, this will certainly not be any longer added in my miniature.
A superthank you to all.