I have just done this on my SV, however I have a hammicad tail tidy on.
The bar that runs along the back is an issue and depending on the angle of the R&G tail tidy would potentially will sit in the middle of the Reg.
I managed to drop the plate about 2 cms and set the bar in the fully up position which JUST sits above the registration plate numbers.
The actual GIVI design is supposed to be used with the plastic snow shovel where the indicators are bolted. The indicators then move to the Givi frame. I was just lucky that it seems to fit with hammicad tail tidy with everything in situ.
A word of warning the Givi pannier rack for the SV650 is discontinued at both the UK distributor and the at Givi in Italy. Your only chance of getting hold of of one of these now is from a UK supplier that is holding on. I know CMS in Exeter have one left, and that is the only supplier I could in the UK that had stock.
Here's mine:
