Black and Chrome Harley-Davidson was the most popular of the three models. The two models were built in the same factory, in the same layout, and had the same features. The only difference was the color of the chrome and the color of the leather. A simple color change could have been made for the Super Six, but the company decided against it. Instead, the company designed a specially designed frame that could be used to replace the existing leather frame. The frame was made of aluminum, and the body was made of steel. The Harley-Davidson Super Six was the first Harley-Davidson to use a fixed frame, but it was not the last. While the Super Six was the first Harley-Davidson to use a fixed frame, it was not the last. The popular Super Six was built in a similar way to the other Harley-Davidson motorcycles.