what is the correct geometry fixture on a petrol engine 'piston'?

I have developed a model of a piston from a 2-stroke petrol engine.
Other models include a piston wrist pin and bearing.

If I were to undergo a static analysis on the piston would I need to include the wrist pin and bearing?

If not what is the specific fixture on the piston holes? radial, circumferential or axial?

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