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I just recently put the optima red top battery in my Xb and I had to use the height adapter to make it fit right, the Optima was actually smaller than the stock battery, at least in hieght.
i have the red top and i put the biggest one that i could find in there, and it works fine, go bigger so there is plenty of power somewhere colose to 900 cca would be good
I just bought the one they offered at costco, it came with a height adapter that you put on the bottom. Fits perfect, I didn't know they came in different sizes