Here are a few shots of the gurney flap I received from japanparts.com. The quality is OK in my opinion, it seems to be abs plastic or urethane.
Not sure if I'll install it on the car, but it does require two holes to be drilled into the wing and clips mounted, from what I could translate from the instructions (in Japanese).
Big disappointment.
I wish japanparts.com had disclosed that information. However, they shipped super fast!