I finished dimpling the R Outboard Topside Skin and realized after more than 600 dimples that I dimpled it into the WRONG SIDE!! Many bad words were shouted. I called Van's to see if I could safely reverse those dimples and the tech said, "No need... You just made a Left Wing Skin. Try it on the left wing... it should fit perfectly." He was right!! The Top Outboard Wing Skins are identical. The only difference comes in the direction that they are dimpled. Wheeww.