Field of application: For all 75-20 HD models, except 84-20 Softail and 85-20 Touring models
Manufacturer: Progressive Suspension, 13861 Rosecrans Avenue, 90670 Santa Fe Springs, Ca, United States of America, https://www.progressivesuspension.com
Responsible person in the EU: Custom Chrome Europe GmbH, Carl-von-Ossietzky-Str. 8, 55459 Grolsheim, Germany, https://www.custom-chrome-europe.com, info@customchrome.de
Designed to adjust the spring preload on most factory-style shocks (including aftermarket).