First, a bit of history........................the Contour shoves battery way close to hood, the later Focus does it even worse. Currently on the Focus website we have a guy who has subbed a D35 yellow I think and has critical issues with it to the hood. The battery is too tall, but the stores say it fits. It will be likely close to the same on a Contour, both require the terminal to drop down into the battery top itself to fit and have hood closing room. Both also require the terminals to be on one side so the extra height gets absorbed by the heavy hood angle there. The D35 uses centered terminals that stick up and not feasible to use it there, it being like 3/4" too high. I for one do not know if that is the closest battery fit Optima has there but don't care anyway for the following reason...................
Optima batteries SUCK. They are for rough service ONLY and what they shine at, but warping conventional wisdom along with warping sales techniques have you thinking they are a better battery overall and that could not be further from the truth. The warranties are nowhere near as good as other standard batteries (LOOK before you say a word!) and the amps are not that incredible either. The added cost kills any advantage. I used to sell them and had utter fits with all the people that think in some weird way the batteries are supposed to last longer, they actually fail on the norm FASTER on say collector cars that sit a lot, where the value of them really gets bent all out of shape. And, where you get an anecdotal story of this or that brand that went way over the norm in life, I never saw that once on Optima, they pretty much die early or on cue with none lasting overlong like regular ones can. I never saw that, but I saw scads of them fail in 2 years and ridiculous.
Highly overrated crap unless you drive in the rocky desert everyday, then they might be worth something.
Of course, yours and do what you will.....................