By all accounts the spherical are easier to install than the urethane probably due to the all metal ridgidity. The Whiteline's tend to distort / contort and angle themselves under the pressure of the insertion which creates the challenge of the installation. My car will never see the track and I don't drift so using the spherical bushings with their inherent vibration, noise and cost wasn't my first choice. I can now drive the car to it's potential even with the well worn Bridgestones.
