Cheers. I thought they must be Givi panniers. I'll ask when Im at NEC on Saturday and see if they knowThey should know the bike. Givi makes the side panniers and top box for them through Triumph.
The Triumph rear rack mount is a 'floating' mount that allows a little bit of lateral movement in the top box for more secure handling according the Triumph's website.
If the mounting holes and pins are the same on your top box as the Triumph units it should work. Only a visit to a Triumph dealer with your old top box will tell, and if they have a unit there with the mounting plate installed.