Polyurethane Bushing Kit, MK II and XK-120 Steering Pins. This kit replaces the outer metal sleeve and rubber bushing. It retains the main pin. One kit required per car. Our polyurethane suspension and steering bushings offer a number of advantages over standard rubber bushings: They will last the life of the car and offer unequaled resistance to dry rot and ozone. They also offer a seemingly impossible combination of better performance through less deflection but with virtually no penalty in ride quality. Finally, they do not squeak! WeÕve sold thousands of polyurethane bushings over the years and use them extensively in our restoration and service shop.