It's a long time since I fitted it. But as I remember the main mounting points are the headlight bolts (no.9 on the diagram). The holes used to mount the winglets are the ones used as the 'support' mounts (No 8) for the sat nav bracket where No 8 screws into the bracket. I seem to remember that I reamed out the thread in bracket and replaced with a longer bolt with a nut on the end. I may even have used the original winglet fitment bolts, I can't remember. Anyway the bracket has been on 2 S10s for about 20k miles and has not moved.
Hope this helps
Mike
