^^^ The O.E.M kit has two seperate peices that are attached to a stock front valance with plastic trim screws and double sided tape. The kit you gave a link to has a one peice valance but will have to be installed in the same screw/tape method. Hope this helps

Oh yeah, whatever kit you end up buying, make sure it's urethane. Dont waste your time with fiberglass, it cracks way too eaisly

 

The one you have the link to Auto is a one piece front ground effect. The one I have on my Camaro is a two piece, which im trying to get rid of and the rest of my ground effects because I just had to get my Mass Air Flow Sensor and 02 Sensor replaced and drained my wallet 460$. I have a 1999 Rally Red Camaro RS. Message me if youre interested in buying them

 

I don't think I've seen a gfx set for the 98-02 that has a full front piece. There are several kits for the 93-97's, but the front piece won't fit on the newer cars.

 

^^^^ check this out
http://www.lmperformance.com/4181/1.html

 

I stand corrected.