The Harley Lockhart Oil Cooler + Thermostat Bypass Valve/Lockhart Oil Cooler Black is a vintage part designed for Harley-Davidson street motorcycles. It is a universal fitment part with a manufacturer part number of 26251-78 and is made in the United States. This oil cooler is compatible with Harley Davidson motorcycles and includes both the oil cooler and thermostat bypass valve, providing a convenient and high-quality solution for cooling and regulating the vehicle's engine oil.