Yeah, the guy wrote back to me to say that it's not a Stebel but a 'similar horn without Stebel's vibration damage issues.' which I take to mean 'chinese copy,' ha.
I just looked it up, the Nautilus Compact is what I have in my Blur (aftermarket), and it's the one that looks like the one with that kit (which maybe is included now that I look, I can't make it through all that text, ha). It was a bit of a pain to install, even with Nathaniel Salzman's totally solid directions:
http://www.nathanielsalzman.com/diy/diy ... -air-horn/
The Nautilus (not compact) appears to be for cars, and there may be a third called the "Nautilus Max"
So I still believe the one in the Buddy is the "Magnum," which is smaller and easier to install, I see it referred to that in some reviews, but they could be wrong. They're very different looking, so if anyone has a Buddy under-the-hood photo, that would settle it, ha.
WebBikeWorld has a great horn comparison with audio samples:
http://www.nathanielsalzman.com/diy/diy ... -air-horn/
My aftermarket Blur horn is def. the Nautilus Compact.