My trunk was @ $70.00 from JC Whitney. The trunk fits fine and latches to the Givi rack no problem. The only issue that you may have is a bit of play vertically at the back while latched. The remedy is to build up the rubber bumpers or spacers under the backside of the trunk. There is a bit more play at the rear of the top box than that of a stock Givi top box on a Givi mount. I first mounted it with a rack I made with Givi mounting hardware and an aluminum plate. It had the same spacer issue. I saw a Givi rack at a great price so I purchased it and replaced my “custom” job. I have had no issue with the trunk or stability at speed. It has been up to 125mph with no problems.
Best,
Jon