The brass shifter bushings are an excellent idea and will far out last the plastic factory bushings. A discovery made a few months ago - for the W123 shifter bushings and possibly other models a kitchen tool,called a cherry pit remover is a great tool to install the,plastic shifter bushings. It resembles a pair of pliers with one side holding the new shifter bushing and the other side forcing the bushing into the shifter,rod when the plier action is applied. It helps to heat the bushings a little in a microwave,or boiling water to soften the new bushing a little and apply a little silicone grease. Good luck with your project. Shifter bushings should be a regular maintenance item