What is wrong with it, why do you want to replace it?
I also have one lying around, 100x15 (M14x1.5mm thread) (non boost) original Fox. Let me know if you don't come right.
The most important thing is to check if the thread is M14 or M15. Fox tend to use M14, thread diameter 1mm smaller that the thru-axle shaft, and then the thread pitch is also important, as far as I know Fox mostly use 1.5mm.
Where are you located?