Please ignore my last post
I originally said the box went on the frame but the lungs would not lock off as they looked about 5mm bigger than the old one

Well I borrowed my friends K1600 top box and removed the rack from my bike (it was either play with the bike or go shopping with the wife: BIKE WON)
Having the whole box and frame free and upside down on the bench I've had time to mess
I removed the 4 sticky rubber blocks of the top box (One by each lug) and it fits perfect, the lungs are only self sticky so they have gone back perfectly
I'm now going to buy one
Once I have one I'll tell you how I get over operating the brake light without the Cam-Bus. If Police bikes have additional lighting, so can I
Wish you all a brilliant biking New Year and Stay Safe