I've seen some LS bikes with Krauser bags, so I'm sure that the bags can work. You will have to do some sort or surgery to the rear platform rack and the arms which support it - not sure about the lower connecting piece - it might work without modification, but I cannot tell for certain.
There is a "loop" welded onto the lower, back end of the bikes subframe, just ahead of the tail light, where the cross connecting parts normally bolt through. Usually, the lower "arms" on the front of the parallelograms have to have the bolt holes oriented vertically, rather than horizontally, to matchup with the bolt holes down near the pillion footpegs on the R65. If those don't have the proper oritentation, it is possible to fabricate some sort of adapter L bracket, I think.
If they can tell you what bike this was used on before, that might help a bit more with understanding the possible fitment issues.