hi ive bought a v8 sti spoiler which apparently is genuine at least its made in japan 2 piece and its got the screw on plate on the underside of the top blade for stiffis,Its got 4 threads to bolt it on with, and about 9 raised rectangles for extra bolting but the are unthreaded? is this normal and if so how do you bolt to them thanks for any help

 

think you may need to put up a picture to help on this one

Darren