It's my understanding that the stunt knife was molded off of the hero. Given that, and given that the stunt knife appears in the visual companion, I have to say that my Liberty Bowie lines up pretty well with the stunt knife in proportion and notch placement.
That's about all I can safely say as I don't have any photos of the hero to compare to.
But it's also my understanding that the Hero is an off the shelf Liberty Bowie and so any Liberty Bowie should fit the bill, unless for whatever reason there were different notch placements on different runs of the Liberty Bowies.
Just my small bit of information that I can verify.