BMW reference: pack-77415A14873 This complete BMW black aluminum case extension pack (13.5L) can be installed directly on your aluminum cases without having to buy anything extra. Codable lock cylinders are included in the pack. The original BMW Motorrad aluminum case extension is designed to enlarge the volume of your original BMW Motorrad aluminum case. The original BMW Motorrad aluminum case extension fits your BMW R1200GS/GSA - R1250GS/GSA - F850GS/GSA perfectly. Installing the original BMW Motorrad aluminum case extension allows you to gain an additional volume of 13.5L per case. Attention additional locks are necessary for the use of this extension, they are sold separately. This extension is sold alone, if you wish to add it to your two suitcases, you must select two. BW Motorrad suitcase extensions are perfect for going on a road trip or on a trip with maximum storage space, in addition they are made of high quality materials. The installation of this original product is very simple and quick, there is no complicated assembly. Using an Original BMW Motorrad case extension package guarantees a perfect fit on your motorcycle. By using BMW Motorrad products, you keep the unique BMW style and extend the life of your BMW motorcycle. Another advantage is that BMW Motorrad products are covered by a 2-year warranty. Additional Information : Original BMW Motorrad product Perfect fit High quality materials Capacity: 13.5L Complete package Coded lock cylinder included BMW complete pack black aluminum suitcase extension (13.5L) GS/GSA