I recall mine on the old car being somewhat squared off/mild rectangle. What's on the new one are small circular mirrors -- not much viewing area. Interested in clean L & R originals, or decent repros that look like originals.
The one we had growing up was round and about 4"?
Similar on the '64 GT I have now.
The '64 wagon's mirror is snapped off, so can't tell what used to be there ;-)