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I wouldn’t consider it heavy duty. It is likely a “competition suspension”Most likely that term is being applied to the big suspension carshttp://www.thecoralsnake.com/69suspension
The XHD-F-60-15 tire shelby option that started late march 69 standard on 69 shelbys both 350 and 500. The only difference is the size of the 4 tierods nuts bigger size.