I recently bought some Westin nerf bars and installed them myself. They mount using the body mount bolt and locations. My problem is, I can't keep the bars tight. They loosen up and creak and pop when I drive down the road. Any suggestions on fixing this issue? I see I am crushing the OEM rubber spacers, do you think I should swap them for Polyeurothane?

'02 QC 4x4

 

torque them more... really. put a pull bar on there and crank em down. its a big bolt right ? put 100+ pounds on them.