I have a set of 5.5' bed rails, they will fit just about any short bed truck excluding the sport box s10's and colorados.
The primary tubes are stainless steel and have no rust, and they have to be bolted to the bed sides.
The picture is of them on a 6' 82-93 s10 bed. I also have a fiberglass tonneau cover for a s10/s15/sonoma 6' bed for sale that is cut to fit these bed rails exactly. If you buy the tonneau cover and the bed rails I will sell for $70.
If you are interested or want more picture text