08-15 YAMAHA XV19CS: Baron Custom Accessories Slam Kit Save money by buying this lowering kit and spring combo. The kit includes a Heavy Duty Shock Spring and a Lowering Kit. Raider Heavy Duty Shock Spring: Designed to work with stock shock. Allows for the smoothest possible ride on lowered bikes or two-up riding by alleviating bottoming, sagging and diving. The 993-pound heavy duty design gives you the comfort and control you need for a plush ride always.