Both wings were freebies, so it can be modified in whatever way will work
If I can't get it to sit flush I will just keep trimming until it matches up (or bog / fibreglass it over).
The factory spoiler is shown in the image below, and is the only rear wing I've had on a car. Bling and tack-ons don't really appeal, it has to be functional or there's no point shelling out my hard earned. These are a little different because they were free (I would sell them, but they aren't really worth anything)