The main difference, and probably why so many places have a hard time finding a battery for our cars is that the posts are reversed.
They make an Optima, ask for a 34R red top, it used to be orange, but they converted it to red to match the rest of the line.
I put one in my SVT at about 3 years old and have loved it since. I piad about $120 at a Beattery's Plus. This was ~$5-10 more than online with shipping and I figured if I did need to warranty it, it would be easier to do in person and no shipipng.
Surely they make normal replacements too, probably just need somone with a clue, try Autozone, their website shows a Duralast w/ 7-year warranty for $70 + $8 core charge. That is Duratec, but I am sure Zetec could use the same.
Good luck!
