OK, great info , thanks.... So R1 swingarm will fit but requires cutting/ grinding & welding, ..... then I wont consider that option... looking for something slightly simpler.
Manufacture of spacers, collars, linkages, etc is fine, but prefer to stay away from cutting & welding.
And the FZ1/ FZ8 will fit the pivot area without mods ??
The pivot area is my primary concern at the moment. I can find/ manufacture suitable shock linkages once the arm is in place.
I have found out that FZ1 and FZ8 arms are the same part number 2011 thru 2013.
Earlier FZ1's have a different number but it looks like (?) the difference is only on the rear brake line mounts. Will search for suitable samples to view & confirm.