Do I need any additional hardware to install these?

Installation uses your existing factory mounting holes and fasteners. Check your factory service manual for torque specs and whether you need new bolts — the rails themselves don't include hardware.

Will these fit my bed if I've added bed liner or accessories?

These mount at factory rocker points, so bed liner thickness or other accessories mounted to the bed itself won't interfere. Test-fit before final tightening if you have aftermarket items near the rocker area.

Can I polish or touch up the chrome if it gets scratched?

Chrome plating can be polished with standard chrome cleaner and a soft cloth. Deep scratches or flaking require professional re-plating — minor scuffs won't affect function or longevity.