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On road cars typically run a smaller cooling head because they run at high speeds, so there's a lot of air moving over it. With onroad comps, shaving weight is everything, and if they can get away with less surface area, they do. Was easier to see a few years ago when you would go to a site...

The lower the nitro, the less shims you use, in general. But I think you should always have at least one, just for the sealing purposes. I'm with @D3MON on how many. Higher nitro (26%+) usually requires the combustion chamber to be larger or it detonates early vs combusts when it's supposed to...

Quick google search suggests they are part number 74521-15: http://rc.kyosho.com/en/74521-15.html The 2 round/shiny ones are head shims, which are typically made of copper/brass/aluminum which are soft and malleable so that when you tighten the head down, they seal any imperfections while also...