Black paint is a rust preventative

Fuel tank with OEM styling but wider to hold more fuel than the stock peanut tank

or pre-ignition

OEM replacement reference 16853-48

LEGEND, AIR-A 13" AIR SUSPENSION. BLACK FLTR 2015-22 Knucklehead Black paint is a rust13" long. The latest developments in air suspension for H D models, offering one of the best possible rides man could wish for. Comes self adjusting deflective disc dampening and the latest Aramid Fiber air spring technology to maximize travel and provide full adjustable ride height at the same time. It's like having 12" and 13" shocks in one. Smooth no stick damping due to low friction seals and quick reactions on fluid flow management with High Flow