Well, actually...
Sorry this is a bit vague, I read it all thirty years ago or more. Can't remember what model of car it was but it was a car used in a famous rally or endurance race, during which it was crashed and a chassis rail damaged. As a temporary repair, a length of angle iron or similar was welded in, and after the race the chassis was properly repaired. The car was up for sale, and included was the length of angle iron that had been welded in.