GX200 and Clone Billet Rocker Arm Set - GX200 and Clone Billet Rocker Arm Set. This set up replaces the stock rockers with 1.3:1 ratio billet steel rocker arms, heavy duty billet steel rocker studs, lash caps, rocker pivots, adjuster nuts, set screws and a billet steel guide plate. Click on the thumbnail below to view a copy of the instructions that are included with the kit.