Moal Competition Fuel Cap Straight off the dirt tracks! The competition fuel caps bring back style from track roadsters of yesterday. Made of cast aluminum with steel linkage arms and aircraft clevis pins. Caps measure 5-1/2" in diameter at the base with a 3-1/4" opening. Buna-N rubber o-ring keeps the fuel where it belongs, in your tank! Caps come assembled ready for polishing and plating, or install as is for that race ready look! Normally $599 $475 +shipping