i havent done it but
this might help
put sum paint on the tip of the screws that comes from the spoiler
press it to the body of the car on the desired location
then you'll have markers where to drill holes
you gotta be precise tho, you have press it exactly where you want it
i guess do the middle piece first
cuz it goes from end to end
so that way you have a guide with the side pieces
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