Biker's Choice POL ALUMINUM SEAT KNOB Seat Accessories Seat Knob & CoverL72-97 Sportster, Big Twin - 74547S1 Street American V-Twin &gt; SEATS &gt; Seat Accessories &gt; Seat Knob & Cover Application: L72-97 Sportster, Big Twin Biker's Choice Seat Knob & Cover 74547S1.