5mm center hole for easy mounting

though the tank was otherwise the same

nut lockwasher

heat treating

With the included allen hardware

Heavy-Duty Fork Springs 2006-17 Harley-Davidson FX Models Brand_KD's Sunglasses 5mm center hole for easyThe 'Original' Progressive Rate Fork Springs soak up the small road bumps, yet are firm enough to absorb the molar rattling ones. Spring rates have been chosen to reduce front end "dive" during braking, yet still provide excellent ride comfort. Better yet, they warranty our fork springs for life! Progressive Rate Fork Springs have several advantages over straight rate springs. A Progressive Rate Spring has the advantage of a rising rate resistance to