update...
I have 3 chain guards. dont ask. I looks like the chain guard will be the perfect donor to fab a bracket that will attach to the bolt used for the pillon/luggage rack.
I cut it out of cardboard and it seems to work. I'll get it Fabbed on Wednesday. I need a rubber stopper to keep it from banging against the fenders paint, and some sidewalk bolts to mount the Z-plate.
It's gonna be sweet, and no new holes in the fender so it can evolve.