All the 67-68's had vented caps, both years used the same tank configuration with a tank and a filler tube and joined by a neoprene hose. I'm not sure if the 69's did too. I was looking to replace mine fuel cap, but all I seem to find is the ones with a dimples on them and they are vented. As I said earlier they are Camaro caps and they won't fit. If anyone knows where we can get a vented cap from it would be helpful.