V-Twin Mfg. 39mm Fork Slider Assembly For Harley The fork slider assembly features hard chrome fork tubes paired with chrome sliders, complete with springs and all required internal components pre-installed, ideally suited for single disc applications. Features: For single disc applications Sold as a left and right assembly Sold as set Replaces OEM 45900-04 Note: Drain assembly lube. We recommend 20 weight oil for average conditions.