There are guys here that know more but maybe this will also help ya.This blurry photo of my wife's 51 shows the other tailite placement when there was or is no bumper.The lights are lower and the lens face is about even with the stake pocket rear edge.The left tail light came on the truck, the bracket looked uncut, so I figure this was the original set up.I made the right bracket to match.the lights look identical to the eye, but the camera flash shows the difference between the old plastic lens on the left and the new one on the right.
51 pu tail lights.