Depends on whether or not you want to go steel or use the cast alloy main part of the existing bracket , mine is on a GQ and Jff has got his on a GU .
I have some bits and pieces and a template so will get some photos and try and splain which way I went about it if you like , yours maybe slightly easier wiring wise as I only had three wires in the door for the mirrors I believe some GU's have five .
Do you want the heated function to work ? For me it's just the blinkers and mirror movement to keep it simpler .
While your waiting work out if you want to do it in steel or aluminium but either way can I suggest getting a bit of scrap ply or acrylic sheet to make a template of your original mirror and how it fits to the door , my left and right sides were the same for my template just reversed so I only needed the one template .