How do you anchor a bolt in roll bar?

[TheJDMan]

According to SCCA rules if you bolt in a roll bar or cage the mount pads must be backed up with a plate of equal size on the back side of the panel. My Question is, since the roll bar main hoop pads set on top of the rocker panel boxes so how do you get a plate on the back side? It occurs to me that I could weld a mount plate to the surface of the rocker box then bolt to the welded plate. How does everyone else mount their bolt in roll bar? Does anyone have any detailed pictures of your roll bar mounts in a 1st gen they would be willing to post?