I went with the Givi, because at the time I thought that was the only way to mount the Givi box. I'm glad I did, because it turns out it's a steel rail vs the plastic factory rail and platform. Higher weight rating.
My '03 silver:
It is looks great ! I am definitely use this solution to mount v46.
2 more question.
What is a color of your GIVI Case ? Do You have silver colored or black ?
And to be sure, I need to buy only "GIVI SR346 - Case carrier", and what is the name/symbol of the plate that you are using ?
They recommend E250 but I don't like it