12AH is more common. I have noticed “14” in the model number of some of the AGM’s I’ve seen. Regardless of the model, look to the specs instead: 12V, 12AH - and the orientation of the polarity for the cables to land at the correct spot. Not to say you couldn’t use a 14AH battery, but the higher you go in amp hours, usually the bigger the battery gets and then you’ll run into the problem of it not fitting in the battery box.
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