So this car has had a previously installed front spoiler? In my experience changing these out, its almost impossible to re-drill the replacement spoiler to match the holes in the old one. You might get lucky and hit a few close enough to work, but generally you're better off drilling new holes through the spoiler into the valance. Hard to do, unless you have a friend to hold the spoiler in position while you drill the first few holes and get enough screws in place that it'll support itself.