Original BMW exterior accessories offer you a new outlook, with stylish options such as high-quality alloy wheels and powerful aerodynamic components. All of them have been specifcally designed to complement the sporty and distinctive lines of the BMW Z4. Undergoing stringent tests on both the materials and design to ensure that each component meets BMW’s strict quality standards. So you can be confdent your BMW Z4 is as good to
drive as it is to look at.

If you have this sporty car you must download this book in pdf file format. Original 2009 BMW Accessories Catalogue.pdf

This books about  Manual Maintenance R 850 C R 1200 C BMW AG Motorcycle Guide .  This book is easy and useful for your BMW Motorcycle Manual repair Guide. This contains any information about BMW motorcycles All 1989-94 BMW vehicles are equipped with a self diagnostic system for the detection of injection faults.

Short description from PDF about Repair Manual R 850 C R 1200 C BMW AG Motorcycle:

This repair manual will help you to perform all the main maintenance and repair work correctly and efficiently. It should be consulted regularly by workshop personnel as an addition to the practical and theoretical knowledge obtained in Training School courses. It is a contribution towards achieving even higher Service quality. A new issue of this repair manual will be published if amendments or additions (supplements) are needed. The latest issue date is shown in the header of the microfiche. Microfiches rendered invalid by the new issue should be destroyed without delay. All information in both text and illustrations refers to motorcycles in standard condition or with Original BMW accessories installed, and not to motorcycles which have been modified in any way to depart from the manufacturer’s specification

You can find the details here