The SM 4236 is a premium-grade Self Starter Rocker Assembly (Brush Holder) precision-engineered for the high-output starter motors used in Jaguar and Land Rover luxury vehicles. Designed to meet the rigorous demands of high-compression Ingenium engines and V6/V8 platforms, this assembly utilizes a high-efficiency 4-brush configuration. It is built to support smooth, rapid ignition and the frequent duty cycles of vehicles equipped with advanced Stop-Start technology.