Mercruiser Thermostat Housing - 18-1989 Mercruiser Thermostat Housing - 18-1989 by Sierra. Please use the Red PARTS CHARTS button (top of any page) to locate the correct part for your application. $ 202.24               More Information      Quantity:     Thermostat Housing - 18-1989 Thermostat Housing - 18-1989. Please use the Red PARTS CHARTS button (top of any page) to locate the correct part for your application. All prices are per unit (50' Coil=50 Units, 2 PK=2 Units, and etc.). Verify your quantity is correct at Check-Outn adjust as necessary. Send us an email (Contact Us button at top of any page) if you have any questions. $ 202.24               More Information      Quantity:     Water Pump Kit 18-3256 18-3256 WATER PUMP KIT Replaces: 17400-93951 Fits: DF 9.9/15 (1997-04), DT 9.9 (1985-87), DT 15 (1983-88), DT 15C (1989-97) $ 20.42               More Information      Quantity:     Water Pump Kit 18-3254 18-3254 WATER PUMP KIT Replaces: 17400-87E03 Fits: DF 60/70 (1998-01), DT 90-100 (1989-01) $ 49.60               More Information      Quantity:     Water Pump Kit 18-3255 18-3255 WATER PUMP KIT Replaces: 17400-92D01 Fits: DT 8C/9.9C (1989-97) $ 24.56               More Information      Quantity: