How do I tell which kind of car I have?

So I'm looking for an A/C compressor and on Amazon, I need to specify whether my 2012 Ford Fusion Se is a "2.5 L4 gas" or a "3.0 v6 flex". I've looked through the car manual and on pictures, but I can't tell which one I have. How do I find out?
How do I tell which kind of car I have?
How do I tell which kind of car I have?
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