How do I attach a BMW Aluminium Top Box to my Ural?

Now before I get slated I know pictures are important. I have uploaded a picture of my rig, hopefully it works. If not I will revisit that.

I have a 2016 grey Ural, which I bloody love. I mean my GS is awesome at covering ground and well; just working!!! But the Ural has a charm about it, and as long as I survive the ride then all is good.

But I have acquired a set of BMW luggage (Aluminium) for the GS. I don't need the top box as I have one. But was thinking of mounting it on the Ural. Is there a plate or bit of kit I can "weld" to the Ural and have a BMW top box fitted?

Thanks

It worked

Stand down, Ive found the part I need. Good excuse to show off the rig though.