Reproduction 4 Speed Parts Book. Originally used by dealers 30 years ago. Majority of the parts books include every part originally on the bikes with exploded views and diagrams of each section of the bike. All parts are numbered in pictures for cross reference by model, part number and part name. A great reference when you are restoring or just repairing a Bultaco. Exploded views show what parts were originally on the bike, a big help when you are trying to figure out what changes someone has made over the years. Just give us you model/serial number and we will send you the correct parts book.