Kuryakyn 7358 Zombie Gas Cap (Rh Thread Vented) Extend the Zombie&trade; theme to your tank with this direct replacement vented gas cap for O.E.M. Harley-Davidson&#174; screw-type tanks. Made from quality die-cast aluminum, the Zombie Gas Cap features the signature Kuryakyn skull design. With a diameter of 3" and instantly raises the bar for sinister styling. Note: Right-hand thread.