As far as I know they are the only company making replacement sheetmetal. All other companies that sell it get it from Goodmark. I have bought many products from them; lower quarter panel patch for Challenger, quarter skin for Challenger, both quarter skins for 71 'cuda, outer wheelhouses for cuda, rear valance with cut outs for both cuda and challenger. They have all been decent, but all have required some modification in order to fit properly. Of all the sheetmetal that I have gotten from them, the cuda rear valance fit the best and required the least amount of work. Supposedly things like the full quarters and fenders are to factory spec and will fit correctly, but not sure.