I have used Testors Italian red, the original enamel, though I believe it comes in the master modeler acrylics now too.
This is as close as I have seen to Ferrari red, which was the Italian national racing color originally.
For the Schuey car I mixed Two parts Italian red to one part Chrome yellow, Not sure how accurate that is but it looks different enough to show the change in color.
For his 2002 car I mixed the same colors only 60-40 and of course Tamiya then came out with a color that is supposed to match it.
Don
I know it's only rock and roll, but I like it.