In case anyone is wondering, this is what the OEM rear spoiler installation kit looks like.
It's just a template for drilling the holes for the spoiler. Pretty expensive for a piece of template, but I think it's worth the money to guarantee correct hole drilling. The OEM spoiler comes with clips pre-installed, so it's hard to use hole drilling markers to get the precise drilling location.
I'll probably sell the template soon since I'm done with it lol.