Thanks for the reply. I am not talking about hanging her off the back by 2-3 feet here. Just slide the sissy bar back about 2 inches. She would actually sit exactly where she sits now - on the seat in the same place as always, only the back rest would be back farther. I see the mounting bolts and that is why I ask - it looks like with a couple of drilled holes, one could move the sissy bar back depending on the hole locations. Just not sure and certainly dont want to mess things upI dont think you can, the sideplates mount to the fender strut bolts.
And your passenger would be sitting way to far back if you could which would most likely be a safety concern.