Oh and if it doesn't have a template, you can put something like a piece of tape (loop it around so it mimics a double sided tape) and this way when you place the duckbill to test fit, the tape will stick to the trunk. Then lift off the spoiler, and use that as a marker to drill your holes.

For me, I plan to install the duckbill with double side tape, and then drill from underneath with self Tapping Screws, assuming mine doesn't come with a template.

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Good info. Thank you both!