This is a diamond plate rack extension that allows the installation of a top case that doesn't interfere with the access cover that you need to unlock and remove to use the small storage space and seat release on the F650GS. You can use the same mounting attachments as the existing luggage rack by using spacers between the 2 racks and longer bolts with quick-release fasteners. I also have a Pelican 1450 case (approx. 16x12x6.5") that I will sell for an additional $85 or the rack extension and Pelican case for $150 plus shipping in USA. The Pelican case works beautifully because it's very strong, low profile, lockable and waterproof. Questions? Call (605) 351-1832 in South Dakota. Thanks.