If you're referring to the chrome cap with the black "S" shaped handle, no, that is not an original assembly line piece. IIRC, it's made by Stant who is the OEM, but, it didn't come on the cars when they were new. It's a replacement cap and is similar to the '67-70 version, but, the center is slightly bigger on the later one. I've seen many a filler neck ruined trying to jam that later cap on the early filler neck.