Yes Waffle, thanks, but it brings up another question. Both of those said 12 1/16, where as the other two sources stated 28 and a fraction.
On the second image it says "spinner mount", so does this mean it isn't the entire spinner, but only a portion where they mounted the prop?
That would mean that from the "spinner mount" portion to the base of the nose, you would have to widen it by at least 8 inches, and that just doesn't seem right to me.
confusedly yours,
Mensa
edit:

I think that best depicts what I'm trying to say.
I'd have to say though, the most likely answer to all this is that I have no idea what I'm talking about.