I've been using this for about six months. It's a universal motorcycle rear box, a top case. The carrier on top was purchased separately and modified for installation. The armrests were also purchased separately and modified for installation. Everything is included as a set. Mounting stays are included. The case itself is 48L, a considerable capacity. It can hold two helmets. Great for camping trips on your bike. The top case had a backrest, but it was modified and has holes. Consider it a bonus. Two keys included. Makes tandem riding much more comfortable. Since it's large, I will disassemble it for shipping. If you want the bolts I used during installation, I'll include them. Buying these separately would be quite expensive. Various holes have been drilled during installation. It's still usable, but please consider it a used item.