Door striker threads stripped out

[bhap]

On my 62 C10, one of the 4 bolts that holds the striker to the cab is stripped out. It feels like there are two plates inside the cab that are threaded for the bottom or top two bolts. Is this plate welded to the cab or just held in place by the bolts (and maybe a wad of body "dope", putty type sealant). I can put a longer bolt through the plate and use a nut, but if I can remove the plate I can either replace it or use an insert to restore the threads. Anyone had one of these out before that can tell me how it works? Thanks