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 and compliments our matching Dash Inserts and Ignition Covers.