A cars main parts that are vital and must be built in the factory with, are the rear and front bumpers, which help in the protection of the vehicle from crashes and mishaps. The Buick GS455 rear bumpers are designed in the manner to absorb the impact from crashes; they are pieces that are bolted onto the lower rear area of your car. However the Buick GS455 custom rear bumper is used to style your car. There are different styled bumpers available to suit your liking and choice to install with combination of the side skirts and the front bumper. These Buick GS455 carbon fiber rear bumpers are made of ABS plastic, carbon fiber and high quality fiberglass.