I used a Britax seat in the Cobra with my kids. Now, they sit in a Britax booster seat in it. You may need to bring the Cobra to the car seat store and test fit a few of them. Some are wider than others and will not fit. Also pick up a pair of safety ear muffs that will protect their hearing. My kids love the Cobra.
Here's a pic of the car seat
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Here is one of the booster seat.
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I love your color combo on your car. Enjoy.........