Coil Springs used in DIRTY AIR front air suspension systems - 41mm springs used in 2013-down touring models and softail models with 41mm fork tubes. 49mm springs used in 2017-up touring models. 2014-2016 49mm touring models use the stock spring, just remove the preload spacer tube from above the spring. Our 49mm springs can also be used in 2014-2016 touring models to replace aftermarket lowering springs if stock springs are not available.