I hazard to say this since someone will end up doing this on a road car but the spoiler is a close fit on a Mira L200 roof. I have one that I’ve hung onto as the first thing to try if I ever get to the point of needing rear down force on the track.
If there is anyone local with an L200 that could pickup, the skirts are almost a perfect fit and the wing goes close too. Otherwise, I’m keen to orgainise a courier to pick up.