What is the battery size for this car?

Hello,

Yes, the correct battery group/size is 86, for the V6 engine.
That will have the correct height.

Here is a guide that covers this in more detail.

https://www.2carpros.com/articles/how-to-replace-a-car-battery

Plus I am attaching the info below from the manual on how to replace this battery. Please run through this and let us know if you have other questions or are not sure what specific battery to get.

However, if you still have questions on which battery to use, let us know.

Let me know of any questions.
Thank you.