I looked & could not find the original visors I had, but here are pics of
the replacements I bought & installed. they are curved like yours are.
I am going to say this is what my originals would have looked like, I do remember laying these on top of the originals to make sure they were the same as I knew it would be years before needing them. Maybe you can get another 68 owner to confirm, but I feel pretty confident about it.
