The SM 6153 Starter EGT (Epicyclic Gear Train) Rubber Set is a high-durability internal dampening kit specifically engineered for Bosch-style (B. Type) reduction starter motors. These rubbers are positioned within the planetary gear carrier to absorb the high-torque mechanical shocks generated during the cranking of high-displacement diesel engines. Designed to meet the rigorous demands of both SUV and commercial truck applications, these dampers prevent metal-to-metal impact, protecting the gear teeth from premature wear and shearing.