From the pictures it appears that you have to weld these rock sliders to the frame. Unless you are a welder or have some pretty extensive fab experience I would look for a bolt on option, not to mention if you ever want to go in a different direction with your build welding requires cutting the sliders off. A quick google search yielded these results:
Toyota-4Runner-Rock-Sliders-3rd-Gen-1996-2002-pr-16241.html
http://white-knuckleoffroad.com/toyota4runner3rdgen.html
unless of course you take it to a shop to have them put on and then get whatever you want.... I would still avoid eBay unless you really know what you are looking at. Might seem like a good deal until it shows up on your door step made of plastic, or worse yet leaves you stranded on a trail.
Toyota-4Runner-Rock-Sliders-3rd-Gen-1996-2002-pr-16241.html
http://white-knuckleoffroad.com/toyota4runner3rdgen.html
unless of course you take it to a shop to have them put on and then get whatever you want.... I would still avoid eBay unless you really know what you are looking at. Might seem like a good deal until it shows up on your door step made of plastic, or worse yet leaves you stranded on a trail.