I don't know if these help but these are the colours I used for my 1/48 P-40N (Cleopatra III) which can be found in the AMI Gallery if you want to have a look. The 4 digit reference numbers are MM enamel bottles:
The a/c was OD (FS34087 Olive Drab -1711) over NG (FS36320 Dk Ghost Gray -1741) with the original US markings on the fuselage painted out with RAAF Foliage Green (FS34092 Euro Dk Green - 1764)
I don't claim them as perfect. To get a Humbrol colour match go to the IPMS Stockholm webiste and they should have them over there:
I hope this puts you in the right direction. I am sure that the information is to hand somewhere and remind you these are a general reference from a simple man!!
Kent in Oz