Found this on another site
Powder blue (PPG 12163)
Topaz (orange) (PPG 60812)
Royal Blue for thin stripe between orange stripe and powder blue (PPG 13126)
You can use Porsche colors. The codes are:
Gulf Blue - Porsche 73 - Code 328 or J9
Gulf Orange - Porsche 72-73 - Code 019
For Royal Blue you can take a Dark Blue
This is from the GT40 website:
http://www.gt40s.com/forum/attachment.php?attachmentid=12417&d=1137461869
From another site:
Heritage Blue Paint: BASF WH738989 - Manufacturer BSAF
Epic Orange Paint: BASF WH731465 - Manufacturer BSAF
Black Pin Stripe Tape: 72602 - Manufacturer 3M
Not sure if this will help:
http://www.milspeccoating.com/Federal-Standard-595-Colors-s/41.htm
You can print this off for a color match, but to me the orange looks washed out
That's all I have from a search