[Chuck Moreland]

Do not use those bushings.

In addition to the legitimate issues you've identified, those bushings do not allow articulation on multiple axis as is required of that joint.

The axis of that joint changes with the alignment setting, and the bushing provides no means to accomodate the change - except to crush the very incompressible polyurethane. The result is binding.

Any car that is equipped with those bushings will be very difficult to align and will not have free suspension movement.

They are completely unsuited to the application and should be withdrawn from the market.

Use rubber bushings (as OEM) or monoballs for a high performance solution.