Couldn't have done it without you!
I forgot to add, my reasoning for mounting it via two holes, instead of just drilling the lights into the plastic, was that I figured if the plate was attached to metal it would be more stable.
I have noticed that, for me at least, these lights tend to loosen up over time, and really tightening them down is very hard to do and keep them properly aligned while doing it. Should I use some loctite?