Fan, Flex-Type, Wide Blade, Clockwise, 18.25 in. Diameter, Stainless Steel Blades/Steel Hub, Universal, Each

Use the fan that builds horsepower and is safe to 10,000 rpm.
The Flex-a-lite wide blade flex fans build horsepower by flattening out at high rpm to reduce drag. And because they're lightweight, they help prolong your water pump's lifespan.