BMW Genuine Water Pump Thermostat O-Ring Seal 60 x 3.5 mm for 320i 323i 325e 325i 325is 325ix 328i 524td 525i 528e 528i 533i 535i 735i 735iL M3 M3 3.2 Z3 2.8 Z3 M3.2 Thermostat O-Ring (60 X 3.5 mm) Manufacturer Warranty: 12 months or 12000 miles Please see Product Description Below for Vehicle Compatibility