I've recently modified my 86 VR with a Voiger conversion that I found on e bay.
the conversion was previously on a C 5 -Kawasaki voiger 1200.
The hardware required for the change over to fit my bike cost aprox. $500 + SH.
Up shot is--I have the compleat hardware and inst. book for the (B) frame Voiger to
C5 Kawasaki Voiger 1200. Free to good home--U pay postage