David, Are you refering to the '68s? I believe the "bright metal" rocker panel moldings were standard on all '68. They mount in three ways. First each molding has two mounting strips that are about 18" long. Those are attached to the rocker with sheet metal screws. The molding then "clips" onto those. Second, on each end of the molding there is an "appearance" screw that holds the molding to the rocker. Finally, the molding has tabs on the bottom that wrap somewhat around the rocker and are secured by hex head sheetmetal screws to rocker. You can see a picture of those mouting strips at the bottom of this page: http://www.geocities.com/jims68fb/RockerDrain.html
I believe I have seen most of the big Firebird parts vendors selling the moldings and maybe the mounting strips.
The door edge guards are easily added by drilling (I believe) three small holes.
