I changed my mind on using the original fender reinforcement. I can make the new on with 18ga and add an extra mounting tab about half way between the upper and lower mounting points.
I made the new ones and started with the left fender. Using the shrinker, I started carefully bringing in the profile of the fender and test fitting numerous times along the way.
I made new upper mounting tabs out of 1/8" plate and welded them to the inner reinforcement. Then test fit the fender to the car to check alignment to the door and rocker.
Next, I am going to replace the heel of the fender since the original is in pretty rough shape and I want to slightly sweep the rear of the wheel opening back. I marked where I wanted it and made a template for the new panel.