https://www.classicindustries.com/product/all-years/chevrolet/truck/parts/t70813.html

This is the part I found that I'm talking about. It's for the lower backside of a the front fenders. Looks like it will replace a good portion of the fender and give me a solid surface to cut and fab my flanges. I think if I replace this first then cut past where the fender rolls as stated by another poster. I will be in good shape