Mate if you have compared what you have, against what you have seen on ebay, and they are the same, then I would grab them, I had the same prob with a set myself and found a ballast on ebay the same as I had, bought it, fitted it, and worked like a charm, never had another drama.
If you have a plug and play type set up, its as easy ripping the old one out, and replacing it with the new one.
Swanny