Jim, sent an email but here is the link:
http://www.zingerpropeller.com/ It is a Zinger prop and spinner. I bought both. I think it is a 4.5 inch diameter and has the 18 X 8 blades.
I had them cut the spinner and make the alignments for the screws. Worth the extra $5 - $10 bucks.....
Good Luck. Would also like to hear of your flight with the P-40
MC