Fuel fill tube for 71 Duster

72 and up slide in from the outside. 71 and back go in from the inside. 71 is on its own. 70 has a vent line in the neck. I eliminated the (Collision Impact Protection / vent tube ) in the trunk of my 71 and added a vent line from a 70. I kept my 71 cap so it would still be flush with the body. 72 and up the screws thread into the body. 70 71 the screws thread into the neck. I will put the tube back in my other 71 I am restoring for appearance but it will not be operational for safety reasons. It wasn't a bad idea to send the fuel into the headliner on impact to protect the fuel igniting from outside sparks. But what happened when you opened the door to get out. OOP's dome light. Wonder why it was one year only. Could have bought Pinto.