First thing you need is your VIN #. It on the frame up front by the Front fork neck, on right side. The first number and leter will tell you the Model Code, the next 5 number are the Sequential Number (build #), the next letter is the Manufacturing Code (H+ 1970-1979, J=1980), the last number is the Model Year. From that you can research easily to find all the specific information for your Model and year. FYI there are 46 different configuations that were built.