Copying and puting on same distance

Hello all,
I have model of stadium. What is the easiest way to put chairs on this stadium? Does SketchUp have any free extension like array or something like that? The main problem is that I need to measure every time I put chair to have same distance between every chair.
Thank you in advance!

JHS power bar has a tool to place components along a curve, you can set the distance between every component, the just make sure the origin of the component will be the place where it be placed and the distance is measured from origin to origin.

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I see, thank you. Is there any tutorial how to use it? Because there are a lot of tools.