[OrrieG]

My fleetside had the rear cross sill welded to the sides. But it also originally had a lift gate so that may be the reason. I would guess that most do get welded over time because the tops start spreading if they are really used. Mar-K has some good online information and your can order an assembly manual for like $10. I kept some pieces of my old wood because there are some minor notchs at the rear sill and inner fenders that do not seem to show up on aftermarket pieces I have seen.