Tail gate link assemblies making noises going over bumps

[HeavyHauler]

On my 1968 Chevy C10 SWB fleetside I think my tail gate link assemblies are rattling around making noise when ever I drive on rough road or hit a bump. Is there some sort of rubber bumper or something that could be worn or missing on my tailgate that would cause then to move around and make noise? I can shake my bed back and forth and can hear one or both of them making noises while the tail gate is up in the closed position.