412 Series, 12in. Heavy Duty Spring Rate Rear Shock Absorbers - Chrome. Fits Dyna 1991-2017. - Progressive Suspension 35/39mm Fork Assy's-Tubes & Braces * Quickly diagnoses: Loss of

* Quickly diagnoses: Loss of power

* Requires the purchase of the following caliper # P00522200CH

As the Engine Breathes & the air in the engine Interacts with the hot oil

* Fits DAK-HLY-6000 Speedometers

412 Series, 12in. Heavy Duty Spring Rate Rear Shock Absorbers - Chrome. Fits Dyna 1991-2017. - Progressive Suspension 35/39mm Fork Assy's-Tubes & Braces * Quickly diagnoses: Loss ofFeatures & Benefits: * 412 Series Shock. * Best value shock on the market today. * Simple, durable design will be an improvement over the Original. * Double wall steel body construction. * Nitrogen charged, multi staged velocity sensitive valving. * Smooth, consistent damping. * Multi position cam style preload adjuster. * Progressively wound Spring. Tech Tips: * Standard Spring Rates are recommended for riders that weigh under 110kg. * Heavy Duty