Question about installing Nerf Bars
 

I have a 2004 Blazer LS 2 door. I want to purchase these Nerf Bars for it. Westin SIGNATURE SERIES STEP RAILS - JCWhitney
It says "no drilling required" and "designed specifically to use existing factory holes"
So just incase, I don't want to buy them, and then find out my blazer doesn't have the "factory holes" in which to install the nerf bars. Any one know where these would be located? Did all LS models come with the factory holes? Any help would be appreciated. Thank You!

They hve brackets that mount to the body mount bolts.