Flex-a-lite 1319 Blue Star Stainless Steel 6-Blade 19-3/8" Flex Fan Features the blue star design for a custom look. Six blade design with 2-1/4" projected width Standard rotation fan with maximum fan speed rating of 10,000 Low engine drag at high rpms for better performance Fan should be used with a fan shroud. Fans specifications with 5/8 pilot, 1 3/4  2 1/2 bolt pattern may require fan spacer for radiator clearance Please choose the fan based on the trim levels and engine type of your vehicle