I have those on the back of my bike with the 2 inch offset adapters from kuryakyn. Made it a much better passenger experience for my wife.
here is the one pic i currently haveI didnt have to modify the mounts at all for my front boards. Then again i am using the kuryakyn premium floorboards with the splined adapters that dont pivot. The adapters have set screws that you use to level the boards. On a side note the front boards i have pivot themselves. If you want pictures that are specific let me know.
The boards attach directly to the offsets. The offsets use a standard splined adapter that is requires for your specific application. So 1 set of adapters, 1 set of boards and 1 set of offsetWhich parts did you order for the rear boards with the offsets? You had to buy two sets of adapters, or just one?