Check the listing for details. Progressive Heavy Duty Fork Spring Kit 11-1536. Condition: New. Listed at 115.92 USD. Genuine Progressive Suspension Products: Founded in 1982, Progressive Suspension is the premier US motorcycle & ATV suspension manufacturer. Product Details: Heavy-duty version of the Progressive Suspension fork springs The cost-effective go-to for a substantial increase in front end ride quality Includes Progressive Suspension rate springs combined with preload spacers Can improve front end stability and brake dive control as well as increase comfort for heavier riders or those looking for a firm high-performance feel out of their forks About Us: LeClare Powersports is a small-town Parts and Accessories store in Springfield, MO. Our low overhead allows us to offer better prices than the 'Big Boys', but our owner-operated store allows us to give our customers the great customer service they deserve. We only sell brand new, high quality GENUINE name-brand aftermarket parts...no junk, no knock offs and no "seconds". Buy with confidence!