The SM 4525 is a premium, Original Equipment (O.E.) Grade Self Starter Rocker Assembly (Brush Holder) designed specifically for the Piaggio Ape Xtra series. Identified by the 104 series designation, this assembly utilizes a robust Bosch-style (B.TYPE) architecture with a high-efficiency 4-brush configuration. It is precision-engineered to provide the reliable, high-torque cranking required for the 3-wheel heavy-load commercial segment.