If you are interested in Harley parts old then you might want to buy Harley Davidson Book of the parts list. The first section is a list of books for the brands of motorcycles including Harley parts used in between 1909 and 1932. This manual will include spare parts for the car model, model of Harley and two models of one produced during this period. The second volume in this series includes a list of Harley Davidson models produced between 1930 and 1949.
Antique Harley motorcycle labels and stickers of other items you may want to add to your shopping list. This section is very cheap and relatively easy to find. Online auction sites are great places to find vintage Harley decals, as well as fairs and flea markets Harley.