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The car should have come with a user manual that goes over all of that. Learn it, know it, live it.

High quality plastic will bend and then snap back unless it's a really hard hit. Aluminum will bend and stay bent, or just snap altogether.

Unless it's a very popular model (i.e. Savage, Tmaxx, etc), chances are slim for finding many aftermarket parts for it. Also, aluminum really isn't the best option for a lot of parts, RPM plastic parts are both cheaper, and more durable in general.