FEBI 38810 is identified as a coolant expansion tank with a coolant-level sensor and lid. The exact-MPN follow-up result lists FEBI BILSTEIN 38810, confirms the new condition and reports a length of 235 mm. The result also places the component in the engine-cooling expansion-tank category. These details agree with the supplied reservoir-tank listing and support the proposed product type. Width, thickness, material and other dimensions are not included because they were not consistently established by the strongest returned source. Confirm the tank, sensor and cap configuration against the vehicle before purchase.