I just bought a few sets of the old ribbed rocker panels that they used on the old 280 z cars in the 70's and 80's from a company going out of business. These are original from the 70's, not reproduction. My pics show them in excellent condition. They are approximately 3 inches x 6 feet. They are solid aluminum, they need to be cut to fit whatever car you have, as they were installed in this same way in the 70's.
Shipping will be about $50 in order to protect them properly in a PVC tube during shipping.
Colors I have:
Solid Brite Aluminum
Solid Black
Black and Silver
Gold (Kit is already cut into some pieces - Ask me for pics if interested)
$150 for a set of 2.