AUX switch 5 blunt wires location!! I have looked at bulletin 157...I have the spoiler... do I drill on TOP of the spoiler to the LEFT of the 3rd brake or do I drill from the BACK of the spoiler to the LEFT of the 3rd brake? I wish they had dimensions showing exactly where you have to drill the hole...Should I drill a 3/4" hole giving me lots of room to dig around in there?/