Hello, I'm scratching my head on how to remove the rear bumper on my '70 Sport Fury. I looked in the Service Manual, but they do not explain it. At first, I thought it was going to be like on my '58 : remove bumper bolts, and voila. But they are not accessible from behind. At least not all of them (I counted 3 on each side). So I thought OK, to access those bolts, I just need to remove the lower valance first. But there's 3 screws on each side attaching the valance to the bumper, and they're not accessible either. The last option would be to detach the whole assembly at the frame rail. Is that it ?