BFF4772 Brothers Trucks Billet Pop-Up Fuel Cap. Fits 1955 Second Series-1959 Chevrolet Truck - GMC Truck 1955 Second Series-1959; Brothers "pop-up" fuel caps is a great addition for that custom look. Constructed of high quality aluminum, this cap "pops-up" with a simple twist and then unscrews to provide a custom fuel fill. So we have a chance to make it right - we want your repeat business! Check out the official Holley Performance.