Dually fenders are bolt on. They are plastice or fiberglass. The outer skin of the dual rear wheel styleside box is different than the single raer wheel box. It has the holes for the flars. There is no welding. I own a 93 crew cab dually. Your best bet is to look in the junkyards. I have seen them there in the past. Also, it would be wise to buy the hole box, then you would have every thing you need to make the change. Owen
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