mach 1 chin spoiler

Ok, so I searched and found nothing helpful.. but I just recieved my folded up chin spoiler, and it only has 3 little plastic pushscrews in it.. and my bumper has no holes in it.. sorry to sound like a newb, but I guess i have to drill and get another mounting method, unless 3 screws would do it.. which i dont trust.. help please?
 
whatever, i got the pins from my work for free, and it looks great.
mach1lip.webp
 

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