These are used to mark the holes when placing the spoiler and as a guide for your drill bit.

I didn't get directions with mine, so I wasn't exactly sure what they were at first. Luckily I figured it out before I screwed things up. You should have one for each hole.

Place the drill guides in the the holes on the bottom of the spoiler. I used a tiny piece of blue masking tape so I wouldn't drop them.

You want them to run parallel to the spoiler itself.

Then place the spoiler on the trunk lid and position it to your liking.

Your about to drill holes in your car, so make sure it's even and you like it's position!

When you get the spoiler exactly where you want it, take some blue masking tape and carefully tape the guides to the trunk lid. Make sure it's on good and be careful not to move the spoiler while your doing it.

Once you've got the guides secured, lift the spoiler off.

If you used a little piece of tape to hold the guide to the spoiler, you'll need to press the guide firmly against the trunk lid so you don't move it while peeling the spoiler away. I did this one side at a time, firmly holding the guide in place with one hand, while lifting with the other.

Pop open the trunk and see what's behind where you plan to drill! You want to make sure your not going to drill through anything important or have picked a rough spot to install.

The trunk lid reinforcment looked like it might be problematic. As it turned out it really wasn't, though I need to procure longer bolts for the front.

If you have a problem, adjust as neccassary.

Nothing to difficult here. Using a bit small enough to fit in the drill guide, you're going to drill the pilot holes.

Hold the guide firmly with one hand on either side so it doesn't move. Don't lean on the drill, let it do the work.

Try and keep the drill perpendicular to the trunk lid. (It's not in this pic, because I wasn't drilling yet, couldn't hold the guide, drill and take a pic all at the same time)

Now that you've got the pilot holes, you need to enlarge them to fit the bolts.

My bolts were 15/64ths. I enlarged them in two steps (the first not pictured). I used a bit in between the pilot size before the final size to widen the hole so the 15/64 bit wouldn't "walk" around the hole.

Carefully clean up the metal shavings! Don't want to leave them around to gouge your paint.

It's a good idea to use some brush-on touch up paint or clear nail polish to cover the exposed metal around the hole (inside and out) to prevent rust.

This step is pretty self explanitory. There is only one thing you need to be wary of.

You need to bolt on the spoiler from underneath with the 4 bolts and washers.

If you holes ended up where mine did (or even remotely close) the bolts wont' sit flat when you tighten them down. Notice in the pic how the front hole is on the edge of the reinforcement.

This forces the bolts to torque towards the center of the car.

If you tighten it too much, you may actually crack the spoiler!!!

When I was tightening mine down, I could hear it as I tightened it down. I backed it off a little bit.

I'll either go back and drill the inside reinforcement wider to accomodate the bolt head so it can set flush against the outer trunk lid, or I'll makes some spacers out of 1/4 od copper tubing to "level" it out.

Update:
I ended up enlarging the holes in the reinforcement. One other thing to be wary of is now that the trunk lid is heavier, when you close it, it really slams down.

I'm looking into beefing up the torsion bars to support it better.