I believe if you got the 289 chrome Dress-Up option that it would use a different rounded domed "chromed" oil cap.
The chromed oil cap that you have (I believe) is just a modern "Scott Drake" chromed version of the original "Black Cap" oil cap.
I don't think that back in the 60's that a "Chromed" version of the Standard "Top Hat" Black cap was available. I'd like to see one in a NOS package.. Until now, I have not.
I think that if you wanted a "Chromed" oil cap. You would have to settle for the rounded, domed "chromed" oil cap that was available over the Ford Parts counter.
MCA Judges, Please check me on this..
Thanks,
)
Tony K.