I bought replacement doors and fenders from a dealer that sells body parts for my 78 K20. It is called dundee sheet metal and has a 5 year warranty against rust. It also lasted in a 1000 hr. salt spray test. It is made in Taiwan. It came in the boxes and two said cobra manufacturing and the others said SI international. I paid 100 for the doors and 75 for the fenders. I had trouble getting one side to line up but after a lot of cusing, cutting and grinding they lined up good but not perfect. Does anyone have experience with these companies. how good is this metal?