I'll be posting up my conversion here pretty soon.
Since you asked, here's what I did.
I ground down the two bolt lugs on the front of the 3X clamp. Took a die (8mmx 1.25) and cut threads on the two vertical pins on the clamp.
I drilled two new holes in the GG fender-1/2" aft of the OEM holes. Then I made an L bracket to mount the front of the fender to the Yamaha clamp. I reused the two front holes in the GG fender.
