Stop in for a cup of coffee
Now I remember the details of installing the fender braces. The later models have a wide spot on the firewall seam to hold the capture nut clips for the brace. The earlier cars don't.
In order to use them on an earlier car, the ends of the bar have to be trimmed slightly on one edge, slid over a bit and a use standard nut and bolt since the capture nuts are too deep to work...