Xbox Fighting Stick Please Help

Ok, so I have done a few searches & I can't find any type of converter for this so I need some help.

I want to play on my Original XBox with a fighting stick.
I have an Xbox 360 & a couple Hori EX2 fighting sticks but they are USB.
All the converters I have seen are Original Xbox to PS2.
Does anyone know where I can get a converter? Or will anyone who has the knowledge to make one give me an idea of how much one would cost?
Is there a fighting stick made for the Original Xbox or does anyone have one they want to sell?

I would appreciate if anyone could direct me in the right direction on this one...