412 Series, 11in. Heavy Duty Spring Rate Rear Shock Absorbers - Black. Fits Dyna 1991-2017 & FLD 2012up. - Progressive Suspension Sportster S * Designed for 106ci or

* Designed for 106ci or Bigger Modified Engines with 10

25″ titanium dome tweeter

* Designed with strength in mind

* Cylinder head temp

412 Series, 11in. Heavy Duty Spring Rate Rear Shock Absorbers - Black. Fits Dyna 1991-2017 & FLD 2012up. - Progressive Suspension Sportster S * Designed for 106ci orFitment Details: * Fits Dyna Switchback FLD 2012up. Features & 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