2014~2018 Mazda3 Sedan OEM Trunk spoiler questions

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2007 3i & 2014 CX-5
I just tried to look up the part number the trunk lid spoiler on a 3rd gen sedan, but I can only find parts numbers for the full trunk lid, either with or without the spoiler already installed. Does anybody know how the stock spoiler attaches? Is it screwed on or just double-sided adhesive?
 
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