Ok thought I would do a quick write up for fitting these spacers I picked up off tuff troop....
1. Remove black plastic cover by pulling down and out at same time. This came off surprisingly easy.
2. Unplug mirror harness and undo 3 10 mm nuts on inside of door. Hold mirror once loose as it can fall off now. Remove mirror.
3. Screw on bolt extenders and put spacer in place
4. Hold mirror and spacer back on door, then replace 3 10mm nuts and tighten. Do not over tighten as it's easy to crack the plastic.
Plug in wire loom and replace cover. Your good to go.
Such an easy job, took me 15 mins to do both sides.
Lots of extra wires going into the mirror loom plug that don't go any further on the glx? Maybe for heated mirrors and an indicator on the mirror? Not sure if these are options but def. seems to be more wires than just what's needed to run the power mirrors.