Febi Bilstein Thermostat 175091 - OE Matching Quality and Precision Fit. This is an authorized Febi stockist replacement part with solutions made in Germany. It has 2 connections, an outer diameter of 38.5 mm, and an opening temperature of 105 °C. The OE number for comparison is BMW: 11 53 7 600 584. Please use the vehicle identification at the top of the page to confirm compatibility with your vehicle. We are dedicated to customer satisfaction with over 10 years of online experience. We offer free expert advice, genuine UK stock, no leak guarantee, free UK mainland shipping, express shipping upgrade, and a 60-day returns policy.