Don't buy coils on ebay. Don't buy much at all on Ebay. My ebay forays have been less than awesome, for the most part. Except for some specialized equipment, or unless you know an ebay store is connected to say a genuine manufacturer (they do exist) AND that store has a lot of positive feedback, buying from ebay is like playing the lottery. It is in fact TRUE that if you don't play, you can't win.
Your chances of "winning" are very, very, very low.
Anna