[PWebRPH]

I just installed what I am pretty sure are the same ones you just got, they are sweet. Installation was a little bit of a PITA, but well worth it. The gas and dead pedal I drilled on top of the existing pedals; the gas pedal didn't look like it could come off and when you remove the dead pedal there were holes where the bolts would go. There is obviously a height difference but it is pretty minimal. I am 6'1" and have no issues.
The clutch and brake pedals come off pretty easily, then I drilled holes in the base and bolted them on. The clutch was plastic so that was easy to drill thru, however the brake was metal and a little more difficult. No special drill bit, just as long as they are strong enough to get thru the metal.
If you search aluminum pedals there is a post from about a year ago that has a nice link that I believe perfectlap posted that has pix of an install that someone did, that was pretty helpful for me. Oh, I have a 987, I don't know if the pedals are different on a 986.... probably should have said that sooner.