1971 gas cap

One reason I don't answer the ads for 71 caps . Not to many people want to pay what they are going for. And what if I need one? I sold a driver condition to someone that had his stolen at a car show. I always painted an extra with the car. I am installing a 70 Duster tube in my car. Cap fits from 67-70 and it has a vented fill tube. also sets level when tight unlike the 71 style. They were always tilted