A fuel cap sits on top of the tank like a crown on a queen's head. Have you ever seen an uninspiring, plain and ordinary crown of the queen? We didn't think so. That is why we think Harley-Davidson motorcycles need to be honored with a Performance Machine custom crown for their fuel tanks. CNC'd from aircraft grade aluminum, our unique vented fuel caps are an instant custom addition to 1996-up H-Ds and compliments our matching Dash Inserts and Ignition Covers.