Why don't you guys just install labraks light bracket instead of trying to cover the holes. It's made for people that removed the wing and uses the existing holes for the bracket. Then you can mount a small LED light pod for backing up or setting up camp.
1) Because, if I understand correctly, LabRak's brackets work for this type of wind deflector:
and not this type of spoiler:
2) Recently, LabRak/MetricTLC doesn't have a stellar reputation for delivering their orders: