the fender on the 58 is put together from 3 stampings and the frame rail. so all we needed to do is cut it apart at the factory seams on both of of them and weld it back in. easiest patch panel I have done. this one is on it's second car the white one had been repaired when you could buy this panel from GM. the nice part is i now have a all ready curved patch for the dog leg. some times you just luck out