When sourcing from a factory, you must prioritize OEM-equivalent specifications to ensure perfect fitment. Key technical details include material composition (e.g., high-grade steel for suspension components or heat-resistant polymers for engine parts), dimensional accuracy (verified via CAD drawings), and surface treatment (such as electrophoresis or powder coating for rust prevention). For engine components like turbochargers or fuel injectors, ensure they meet ISO/TS 16949 automotive quality management standards to guarantee long-term performance and reliability.