How important are Rocker panels? And where to Buy new ones.

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So i am in a way or restoring out my r2d mr2 turbo and both rocker panels are completely deteriorating. Does anyone know how much stiffness they give to the chassis? Since mr2s are a uni-body, im sure they are very important, no? Also looking for a place to buy rocker panels, aftermarket or oem. Has anyone ever bought any? suggested place that wont kill my wallet? im sure Toyota would make the price HUGE Any advice would be great