Hi Antiacus
FYI, the Alfa Romeo Colour you are after is the
Rosso Competizione 202, hopefully that will make it easier for you to find the relevant paint from a manufacturer.
I have seen pictures from a German autoshow, where there were 3 or so Alfas painted in the same tone, remember that the cost pr. litre was insanely high! But good luck with your project
The paint is offered, from Alfa Romeo, only on the 8C Competizione and it is my guess that it will be the most popular of the 4 colours available, appearing on circa 350-400 cars. The other types are Alfa Rosso, Yellow and Black.