These are the pictures of the fix for the Insira shelf. You have to look very close to see the aluminum bar. I included a picture of the end of the bar so you can see the type of bar used. I drilled holes through the bar and used the original brace as the nuts. You could use 1/4x20 nuts inplace of the threaded 2 hole brace. You could add bolts at the end of the bar if you feel they are needed. Bar is 1/8"x1"x48".
Ken