I remember reading a thread on rx8 club on that a while ago
There was a rumor brought up that the front diff of a 94-02 Kia Sportage carried a crown wheel and pinion that would fit
Was cheap to buy new too
However, I do remember that a guy went and bought one to try it, and it didn't fit. He ended up buying a FEED set
Great to make these kinda suggestions but unless you have tried it yourself and can be sure it works, I personally wouldn't start someone on what may well be a misled path....