Again, I put 70k+ miles on my QA1 style adjustable strut rods. If you torque the nuts to 75 ft/lbs as instructed they won’t move. The other style that uses a bolt through the LCA attachment is also just 9/16 threaded hardware. I’ve had both styles and had them on and off the cars, I have never seen damage to the threads or the LCA mount that would indicate movement between the hardware and the LCA. Putting a shouldered bushing on there certainly won’t hurt anything, but based on my experience it is not necessary either.