After looking around for some splash guards to help save my fenders I found a guy named Elliot (cet627@gmail.com) who makes some nice and cheap ones for the S2000s. They do use the factory mounting screws and some 3M tape to hold on. I added some 3M tape to the front with two holes to help hold it on the car.

I just wanted to share these with everyone as I was considering the Carbon Fiber ones but they are nearly five times more expensive than these.
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My STi and S2000 are both driven very frequently and these have held up a few weeks just fine.

For installation I just recommend cleaning the area with some water then alcohol then getting the screws in loose before pushing on the tape. Letting it sit in the sun or using a heat gun also helps too.