Wayne, I also love the looks of the Phantoms, and wish I had built one when I could still handle the speed of a Perky style racer!
Found just one Gilbert prop (no spinner) that is 7" in diameter. I assume that it came with one of my Gilbert .11 engines, but I have no plans to use it.
Send me your mail address, and I'll get it on the way to you.
It's free, but I'm looking forward to seeing a photo of your Phantom some day.
Bill