I don't know if this is exactly what you're looking for, but here's what I found:
EagleCals Decals #30,31,32
http://www.kitreview.com/reviews/eaglecalsreview303132bg_1.htm
Squadron.com had this set of decals:
http://www.squadron.com/ItemDetails.asp?item=KPH148013
A few more links...
Revell P-40E
http://www.kithobbyist.com/largescaleplanes/reviews/Revell/P-40E/P-40E_part2.htm
AMtech Forthcoming Releases and P-40E Decal Preview
http://www.kitreview.com/reviews/amtechnewsbg_1.htm
Scale Models : RAAF P-40 Decals
http://p-40.tripod.com/scalemodels2.htm