Progressive Suspension PS-31-2513 Monotube Fork Cartridge Kit for most Sportster 04-21Description for Progressive Suspension Monotube Fork Cartridge Kit 31 2513 Converts dual damper rod and damper rod cartridge forks (02 05 models) to high performance cartridge forks A pair of high performance, gas charged mono tube fork cartridges are included Resistance to front brake dive, front end stability, cornering and bottoming control are improved Modification of forks is not required Included Items: (2) Monotube assemblies (2) Short top out