High quality German manufactured rack specifically designed to fit the BMW 49 litre top case 71607720456.
The facts:

• Sealed, robust attachment at four points. (the tubing has threaded ends)
• Seamless precision steel tubing
• Outstanding chrome plated finish and workmanship.
• Made in Germany.
• Supplied seals create waterproof attachment points
• Includes all necessary hardware

Installation requires drilling four holes in your Top Case lid at specific locations. A bit of patience and mechanical skill is very helpful.
Note that the front holes must be drilled at an angle. The proper tools to do the job are required.