All ebodys had rear bumper guards. On 70,71 and 72 cars, when the bumper guard option was selected front bumper guards were added. The front bumper guards had rubber pads on them. When the front bumper guards were added to the car the rear bumper guards had rubber pads added to them also to match the front pads. The 73 and 74 cars had the guards and pads standard to meet government crash standards.
You could always go without any like on Alloways Challenger.