Does it need complete 1/4s? If they're only rusty on the bottom and they're going to be streached anyway I would get some cheapo skins and stretch them. Less work, the factory 1/4 will always fit better. I didn't have it as good since I fabbed the rust replacements my self. They're butt welded except the stretch. I felt the lapped joint would stiffen the 1/4 without the original inner wheel well. look close you can see the weld. This was the first set I have ever done.
Doug