I have had the best luck with Dennis Carpenter sheet metal. That stuff seems to have the best fitment and quality. Last month I replaced both floor boards, transmission tunnel, both kick panels, and the driver door post on my 66 using all DC steel and couldn't be happier. While I was at it I also replaced the driver rocker using a Dynacorn panel and was not to pleased with both fitment and the thickness of the panel. So in the end, and in my experience recently, Dennis Carpenter is better. You may notice that DC panels cost a little more, but as my old man said; "you get what you pay for". Lastly, and I don't know the validity of this, but I heard that Dennis Carpenter got his hands on some of the original tooling. Maybe that's why his fit better...IDK