When sourcing parts for German vehicles (such as BMW, Mercedes-Benz, Audi, or VW), you must prioritize OEM (Original Equipment Manufacturer) or OES (Original Equipment Supplier) standards. Key specifications include material composition (e.g., high-carbon steel for brake discs), dimensional precision (tolerance levels within 0.01mm), and compatibility codes (cross-referencing the exact VIN or OE Part Number). For electronic components, ensure CAN-bus compatibility to prevent dashboard error codes.