That is a V46, Azokie (and it came off my 2013 FJR before I traded it in for the GT). It's mounted to a Givi adapter plate that's mounted to the SW-Motech Alu-Rack and frame. Replaced the OEM grab rails with the Motech frame and Alu-Rack when I got the bike. Being a 120-mile round-trip commuter, a top box is much more practical for me as opposed to side cases. Got the SW-Motech frame, Alu-Rack and adapter plate from TwistedThrottle.com. Take note, though . . . the topbox frame, Alu-Rack and Givi adapter plate are listed under the FJ-09 '15-'17, not the 900GT.
Also, please read my Aug 03 reply to your initial post re: this subject. It'll describe the minor fitting i.e., trimming a small amount of plastic from the OEM side covers, that fitting the SW-Motech mounting tabs to the bike's bolt holes entails. This pic shows the tabs on the left and right sides of the underseat tray, and the Gorilla tape I used to close up the trimmed tab areas after installation.
This is a pic of the Alu-Rack with the SW-Motech-specific Givi adapter plate bolted to the Alu-Rack. Hope this helps.