I did some poking around with the search and didn't find an answer, so... I'm getting things together to swap the tank on my 74 Duster and was wondering, will a filler neck for a 75/76 Duster with a fixed rear seat fit? Will it still vent through a vented gas cap? I was thinking I wouldn't mind having the flap inside of the neck for those years in case of a rollover. Thanks.