OMC Upper Unit Seal Kit - 18-2666 OMC Upper Unit Seal Kit - 18-2666 by Sierra. Please use the Red PARTS CHARTS button (top of any page) to locate the correct part for your application. $ 45.89               More Information      Quantity:     Upper Unit Seal Kit - 18-2666 Upper Unit Seal Kit - 18-2666. 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-Outnd adjust as necessary. Send us an email (Contact Us button at top of any page) if you have any questions. $ 45.89               More Information      Quantity: