I bought some rockers and cab corners from LMC for my '66. One rocker was .050 thick and the other was .035 and the cab corners were unuseable because they were so poorly shaped and they were mistrimmed. I came across H&H Classic Parts (
www.hhclassic.com ) at a swap meet and was very impressed with their parts. I bought both rockers, cab corners and outer floor panels from them.