SOURCE: 2003 GMC Sierra 1500 tailgate will not lock shut.
Check to see if the mechanizm is siezed behind the handle that lifts up. this is quite common , also check the latches at the ends of the tailgate to see if they are not stuck in the unlatched position ,If they are retracted and won't come back out this confirms a sticky or siezed Mechanism.. WD 40 or someting simular to free up everything works well. good luck
SOURCE: The tailgate support cable on the passenger side
i don't recall rivets on these, do you mean torx head bolts???
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