Engine Coolant Thermostat & Housing. The product can effectively control the temperature of the engine. High reliability and performance, durable and long lasting. Easy installation, perfect match for the car. Replacement Manufacturer Part Number 11531437040, Fit for E46 E39 X5 X3 Z3 Z4 330i 525i 530i 325i. Part Number: 11531437040 Fitment:For E46 E39 X5 X3 Z3 Z4 330i 525i 530i 325i Color: Black Material: plastic+metal Package Contents: 1 x Engine Coolant Thermostat Housing Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.