How do I tell what type (sedan, tour, basic) my car is?

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I bought a used 2006 Chrysler 300 and I need to get new tires but they ask me questions that I don't know the answer to. I looked on the title & I found the 4D which I'm pretty sure means 4 doors and I see a C30 which I don't have a clue what that means. One of the tire sights even allowed me to enter a VIN which really confused me because it came back that I have a different engine than I thought I did. Please help!!!! How can I get THE WHOLE description for my car?