Progressive Fork Preload Adjuster Kit 49mmAdd the Progressive Suspension fork preload adjuster to stiffen up the front fork for aggressive riding in the canyons, or decrease the preload to soften the suspension for a day of comfortable cruising. The ability to change preload settings also provides improved front suspension performance when going from a single rider to a rider with passenger configuration. This Part Fits: Year Make Model Submodel 2018 2020 Harley Davidson FLDE Deluxe 107 Base