Progressive 17-Up M8 Softail Lowered Monotube Fork Cart Kit Adj P/LTrue high performance front suspension is finally available for the 2017+ M8 Softail line with 49mm front ends. Yes again, we've gone back to the drawing board and created a state of the art Fork Cartridge Kit designed to outperform everything on the market. The asymmetrical design places a preload adjuster over a progressive rate spring combined with our road smoothing Frequency Sensing Technology (FST) damper for Milwaukee Eight Softail models. This