damn youre lucky you got the rs with no doorcaps they look much better without them. i am spending so much cash removing factory GS parts (spoiler,door caps soon). they are the simplest install its not even funny, that is if they fit right. i just had a friend hold them where i wanted them and drilled two holes through the rear upper section above the scoops, and inserted those screws to hold it in place, then i drilled a big hole in the front fender area for that screw adn inserted it, then all i did was drill 3 small screw holes in the door sill area, so there are 6 screws per skirt. you can attach the bottom section but you dont need to, this worked perfectly for me so far.
http://www.geocities.com/blue2gnt

1995 Eclipse GS - HRC Stage 2 - Retired.
2004 350z Enthusiast / 2008 Nissan Versa SL