Rear bumpers were accessories. They were similar to the front, but the bend was not as sharp. I have one my father took off a 50 GMC a day or 2 after he bought it. I know they were offered for 1/2 and 3/4 ton GMC. I'm not sure about 1 ton. However few people used the bumper. The tail gate would not drop all the way down and they were not strong enough for a trailer hitch. Most bumpers were after market.
