Correct shade of red for postwar F3A?

Recently I decided to restore some F3A units that I own, however I am having trouble finding the proper shade of red, any suggestions?

http://www.ttender.com/partslist.html

He has a long list of correct color paints.

If you’re repainting late-2383 ATSFs and want to keep the original color, you may have to choose between a true red and the red-orange color that was used.

Thank you.