I got just a regular GT spoiler. I would like the 9.5 like you have but this was more in my price range
But yeah it had 6 holes i had to drill and i found some washers with nylon on one side to seal the holes up around the bolt. Your pic helpt me figure out where to start. But it turned out great. I actually moved the spoiler a little further back than stock so it the bottom lined up with the trunk more.
All the pieces found at home depo for around $2
