If you are talking about the frame bracket they are not welded on.ALL A Body frames have TWO holes on top of the frame, drivers side, Just ahead of the fire wall..That is were it is bolted in.. They are threaded holes.. Randy
Inside the driverside wheelhouse there is a flexible plastic cover screwed into the back-side of the wheelhouse. Remove this and you expose the location for the z-bar bracket on top of the frame.