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At this point I had the option of removing both flanges completely and fabricating replacements or, cutting out the worst sections and making the repairs in a piecemeal fashion. Utilizing my supply of scrap sheetmetal, rather than purchasing a fresh large sheet needed to make the large one-piece repair panels I opted for making several small patches for each side of the vehicle. Using a cutoff wheel, remove any and all of the damaged metal. In this example the rust was the worst on the mounting flanges near the fender boltholes, where the water and debris collected between the two surfaces.