As usual there are plenty of sources that show non-remote mirrors and part numbers for 67 application - though the year of production and Dec 67 MPC does not list any.
Jeff : My January 1967 does not list them either. However, my 1960-68 MPC does (pages are dated April and May of 1968) does. It lists the Remote LH mirror, Part # C7AZ-17696-E, as the same for Full Size Ford, Fairlanes, Falcons and Mustangs. It also shows the "Companion RH Mirror" as Part # C7AZ-17696-C for the same vehicle applications.
Interestingly, for 1968, it shows the Remote LH Mirror as Part # C8MY-17696-B for the same 4 models in 1968, and the "Companion RH Mirror" for 1968, once again for the same 4 models. This says, to me at least, that there were other changes than just the Remote mechanism, handle, etc. compared to '67, otherwise, one would think that they would have carried over the '67 "Companion RH Mirror" instead of giving it a new part # (not being real familiar with '68's, I can't say what the difference might be, as they appear the same in looking at pictures).
Interesting related finding. In a quick view of the San Jose Mustangs I found more unrestored cars without mirrors than I did with the ball style control shaft.
I trust that your "quick view" of SJ Mustangs included both '67's and '68's, otherwise that would be an inordinate amount of '67's that were ordered with the "Remote LH Mirror" deleted.
Bob