There is a small, metal, inner fender type piece that bolts to the the back of the fender and under the bed. I have a pair and they do not fit my truck. Does anyone know if these are different for metal vs. wood beds or year to year? I took them off of a 67-72 truck at the junk yard but I don't remember the year or the bed style, allthough I think it was a metal bed. I have a '70 with a wood bed. I'm wondering if my bed cross rails are in the wrong place? '70 K-20 San Diego, CA I know, I can't spell!