The first photo shows a side view. The'67 has the triangular tang, where the newer (replacement) has the squared-off tang. Not sure why they changed it. The new tumbler fit into the doors fine.
![Don't know :dk:](./images/smilies/icon_dontknow.gif)
The second photo shows the real difference. The '67 uses a peg to engage the locking mechanism. The later lock has the plate with the hole. I had to switch these to make the new locks work in a '67 door. Other than that, it was a real simple swap.
Anyway, enjoy the photos, and I hope it helps someone.
Joseph