Sooooo...in kind of an idiot move i partly tore off the rear spoiler on my X. lol

It broke off one of the brackets underneath on the right side. It is secure enough to not fall off, but moves around a lot when driving and opening the rear hatch.

I saw the spoiler is something like $500 primed, but there are a few on ebay for $200ish.

Anybody know how to get the old one off? I'm assuming taking of the trim inside? Is there a hardware kit on that I should order for the replacement?